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Errors

Error messages

Encountered an error and looking for answers? You've come to the right place.
This section is a work in progress and not yet complete. If you would like to help us document errors in Aurelia, we welcome all contributions.
Coded error in Aurelia comes with format: AURxxxx:yyyy where:
  • AUR is the prefix to indicate it's an error from Aurelia
  • xxxx is the code
  • : is the delimiter between the prefix, code and the dynamic information associated with the error
  • yyyy is the extra information, or parameters related to the error
The section below will list errors by their prefix, and code and give a corresponding explanation, and a way to fix them.

Dependency Injection Errors (from 0001 to 0015)

Dependency Injection errors can be found here.

Template Compiler Errors (From 701-749)

Error Code
Description
AUR0701
This happens when a template has a single template element in your template, and it has as-local-element attribute on it
AUR0702
This happens when a template has one or more attributes that are supposed to be unique on its surrogate elements
AUR0703
This happens when a template controller attribute is used on a surrogate element of a template
AUR0704
This happens when an attribute on a <let/> element is used without .bind or .to-view command
AUR0705
This happens when enhancing a template with one or more element in it already have a class au on it
AUR0706
This happens when [au-slot] attribute is used on an element that is not an immediate child of a custom element
AUR0707
This happens when the template compiler encounters binding to a non-bindable property of a custom attribute
AUR0708
This happens when the template of a custom element has nothing beside template elements with as-local-element
AUR0709
This happens when an as-local-element template is not defined as an immediate child of the root of a custom element template
AUR0710
This happens when an as-local-element template has a <bindable> element inside its template, that is not not an immediate child of its fragment
AUR0711
This happens when a <bindable> inside an as-local-element template does not have a valid property attribute on it
AUR0712
This happens when an as-local-element template has 2 or more <bindable> elements with non-unique attribute or property attributes
AUR0713
This happens when an unknown binding command is encountered in a custom element template
AUR0714
This happens when a custom element or attribute definition has more than 1 primary bindable property
AUR0715
This happens when an as-local-template template has the value of as-local-template as an empty string
AUR0716
This happens when a custom element has 2 or more local elements with the same name

Templating Errors (From 750-800)

Error Code
Description
AUR0750
This happens when there is a binding that looks like this view.ref="...". This likely comes from a v1 template migration.
AUR0751
This happens when there is a ref binding in the template that does not have matching target. Most likely a custom attribute reference
AUR0752
This happens when a controller renders a custom element instruction that it doesn't have a registration. Normally happens in hand-crafted definition
AUR0753
This happens when a controller renders a custom attribute instruction that it doesn't have a registration. Normally happens in hand-crafted definition
AUR0754
This happens when a controller renders a template controller instruction that it doesn't have a registration. Normally happens in hand-crafted definition
AUR0755
This happens when a view factory provider tries to resolve but does not have a view factory associated
AUR0756
This happens when a view factory provider tries to resolve but the view factory associated does not have a valid name
AUR0757
This happens when IRendering.render is called with different number of targets and instructions
AUR0758
This happens when BindingCommand.getDefinition is called on a class/object without any binding command metadata associated
AUR0759
This happens when CustomAttribute.getDefinition is called on a class/object without any custom attribute metadata associated
AUR0760
This happens when CustomElement.getDefinition is called on a class/object without any custom element metadata associated
AUR0761
This happens when CustomElementDefinition.create is called with a string as first parameter
AUR0762
This happens when CustomElement.for is called on an element that does not have any custom element with a given name, without searching in ancestor elements
AUR0763
This happens when CustomElement.for is called and Aurelia isn't able to find any custom element with the given name in the given element, or its ancestors
AUR0764
This happens when CustomElement.for is called on an element with a given name, and Aurelia is unable to find any custom element in the given the element, or its ancestors
AUR0765
This happens when CustomElement.for is called on an element without a given name, and Aurelia is unable to find any custom element in the given element, or its ancestors
AUR0766
This happens when @processContent is called with a string as its first parameter, and Aurelia couldn't find the method on the decorated class
AUR0767
This happens when root property on an Aurelia instance is access before at least one application has been started with this Aurelia instance
AUR0768
This happens when a new Aurelia is created with a predefined container that already has IAurelia registration in it, or its ancestors
AUR0769
This happens when an Aurelia application is started with a document fragment before it's adopted by a document
AUR0770
This happens when Aurelia.prototype.start is called with a null/undefined value as the first parameter
AUR0771
This happens when Aurelia.prototype.dispose is called before the instance is stopped
AUR0772
This happens when the @watch decorator is used without a valid first parameter
AUR0773
This happens when the @watch decorator is used and Aurelia is not able to resolve the first parameter to a function
AUR0774
This happens when the @watch decorator is used on a class property instead of a method

HTML observation errors

Error Code
Description
AUR0651
This happens when the binding created .attr binding command is forced into two way mode against any attribute other than class/style
AUR0652
This happens when the default NodeObserverLocator.getObserver is called with an object and property combo that it doesn't know how to observe, and dirty checking is disabled
AUR0653
This happens when NodeObserverLocator property->observation events mapping is getting overridden
AUR0654
This happens when a <select> element is specified multiple, but the binding value is not an array

Controller errors

Error Code
Description
AUR0500
This happens when Controller.getCachedOrThrow throws
AUR0501
This happens when a custom element is specified containerless and has <slot> element in its template
AUR0502
This happens when a disposed controller is being activated
AUR0503
This happens when the internal state of a controller is corrputed during activation
AUR0504
This happens when a synthetic view is activated without a proper scope
AUR0505
This happens when the internal state of a controller is coruppted during deactivation
AUR0506
This happens when Aurelia fails to resolve a function from the first parameter of a @watch decorator

Default resources errors

Error Code
Description
AUR0801
This happens when & self binding behavior is used on non-event binding
AUR0802
This happens when & updateTrigger binding behavior is used without any arguments
AUR0803
This happens when & updateTrigger binding behavior is used on binding without view -> view model observation
AUR0804
This happens when & updateTrigger binding behavior is used on binding that does not target a DOM element
AUR0805
This happens when <au-compose> scopeBehavior property is assigned a value that is not either auto or scoped
AUR0806
This happens when <au-compose> view-model binding is used with a custom element with containerless = true
AUR0807
This happens when there's a corrupted internal state of <au-compose> and activation is called twice
AUR0808
This happens when there's a corrupted internal state of <au-compose> and deactivation is called twice
AUR0809
This happens when <au-render> component binding is given a string value, and there's no custom element with matching name
AUR0810
This happens when else attribute does not follow an if attribute
AUR0811
This happens when portal attribute is a given an empty string as CSS selector fortarget, and strict mode is on
AUR0812
This happens when portal attribute couldn't find the target element to portal to, and strict mode is on
AUR0813
This happens when then/catch/pending attributes is used outside of a promise attribute
AUR0814
This happens when the internal of the repeat attribute get into a race condition and is corrupted
AUR0815
This happens when case/default-case attributes is used outside of a switch attribute
AUR0816
This happens when there are multiple default-case attributes inside a switch attribute
AUR0817
This happens when & signal binding behavior is used on binding that does not have handleChange method
AUR0818
This happens when & signal binding behavior is used without a valid name (non empty)

Plugin errors

Error Code
Plugin name
Description
AUR0901
Dialog
This happens when an application is closed with some dialogs still open
AUR0902
Dialog
This happens when DialogController injection is requested. It's a error prevention for v1->v2 migration of the dialog plugin
AUR0903
Dialog
This happens when IDialogService.open is called without both component and template property
AUR0904
Dialog
This happens when the default configuration of the dialog plugin is used, as there's no registration associated for key interfaces

Runtime module

AST errors (from 101 to 150)

Error Code
Description
AUR0101
This happens when Aurelia couldn't find a binding behavior specified in an expression
AUR0102
This happens when there are two binding behaviors with the same name in an expression
AUR0103
This happens when a value converter for a given name couldn't be found during the evaluation of an expression
AUR0104
This happens when a value converter for a given name couldn't be found during the assignment of an expression
AUR0105
This happens when the special $host contextual property is accessed but no thing is found in the scope tree
AUR0106
This happens when an expression looks like this $host = ..., as $host is a readonly property
AUR0107
This happens when a call expression is evaluated but the object evaluated by the expression isn't a function
AUR0108
This happens when a binary expression is evaluated with an unknown operator
AUR0109
This happens when an unary expression is evaluated with an unknown operator
AUR0110
This happens when a tagged template (function call) is but the function specified isn't a function
AUR0111
This happens when a function call AST is evaluated but no function is found
AUR0112
This happens when a non-object or non-array value is assigned for destructured declaration for a repeat.for statement

Parser errors (from 151-200)

Error Code
Description
AUR0151
An expression has an invalid character at the start
AUR0152
An expression has .. or ...
AUR0153
The parser encounters an unexpected identifier in an expression
AUR0154
The parser encounters an invalid AccessMember expression
AUR0155
The parers encounters an unexpected end in an expression
AUR0156
The parser encounters an unconsumable token in an expression
AUR0158
The expression has an invalid assignment
AUR0159
An expression has no valid identifier after the value converter ` | ` symbol
AUR0160
An expression has no valid identifier after the binding behavior & symbol
AUR0161
The parser encounters an invalid of keyword
AUR0162
The parser encounters an unconsumed token
AUR0163
The parser encounters an invalid binding identifier at left hand side of an of keyword
AUR0164
The parser encounters a literal object with a property declaration that it doesn't understand
AUR0165
An expression has an opening string quote ' or ", but no matching ending quote
AUR0166
An expression has an opening template string quote ```, but has no matching end
AUR0167
The parser encounters an unexpected token
AUR0168
The parser encounters an unexpected character
AUR0169
The parser encounters an unexpected character while parsing destructuring assignment expression

Others (from 200-300)

Error Code
Description
AUR0201
BindingBehavior.getDefinition is called on a class/object without any binding behavior metadata associated
AUR0202
ValueConverter.getDefinition is called on a class/object without any value converter metadata associated
AUR0203
BindingContext.get is called with null/undefined as the first parameter
AUR0204
Scope.fromOverride is called with null/undefined as the first parameter
AUR0205
Scope.fromParent is called with null/undefined as the first parameter
AUR0206
ConnectableSwitcher.enter is called with null/undefined as the first parameter
AUR0207
ConnectableSwitcher.enter is called with the currently active connectable
AUR0208
ConnectableSwitcher.exit is called with null/undefined as the first parameter
AUR0209
ConnectableSwitcher.exit is called with an inactive connectable
AUR0210
getCollectionObserver is called with an not-supported collection type
AUR0211
a binding subscried to an observer, but does not implement method handleChange
AUR0212
a binding subscribed to a collection observer, but does not implement method handleCollectionChange
AUR0220
a Set/Map size observer .setValue method is called
AUR0221
the setValue method on a computed property without a setter
AUR0222
Aurelia doesn't know how to observe a property on an object, and dirty checking is disabled
AUR0224
Encounters an invalid usage of @observable
AUR0225
An effect is attempted to run again, after it has stopped
AUR0226
An effect has reach its limit of recursive update