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ActionScript 2.0: A Real Programming Language

Dec 19, 2003

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Error Handling

As you build applications with Flash MX 2004 and Flash MX 2004 Professional, you will need to spend time managing bugs and errors in your ActionScript.

Enhancements to Trace

With older versions of ActionScript, the most common way to manage bug tracking was to add a trace to your code. For instance, you could add the following to post to the Output window the results of the trace:

Trace(variableName);

A big improvement with Flash 2004 is that the Output panel can now be docked along with other panels.

Error Messages

Flash MX 2004 Professional can now post error messages to the Output panel. These messages all come as cryptic four-numbered code. The code can be cross-referenced so that you can gain a full understanding of what the code means. Or you can use the following cheat sheet:

Error Number	Message Text
1093	A class name was expected.
1094	A base class name is expected after the extends keyword.
1095	A member attribute was used incorrectly.
1096	The same member name may not be repeated more than once.
1097	All member functions need to have names.
1099	This statement is not permitted in a class definition.
1100	A class or interface has already been defined with this name.
1101	Type mismatch.
1102	There is no class with the name <ClassName>.
1103	There is no property with the name <propertyName>.
1104	A function call on a non-function was attempted.
1105	Type mismatch in assignment statement: found [lhs-type] where [rhs-type] is required.
1106	The member is private and cannot be accessed.
1107	Variable declarations are not permitted in interfaces.
1108	Event declarations are not permitted in interfaces.
1109	Getter/setter declarations are not permitted in interfaces.
1110	Private members are not permitted in interfaces.
1111	Function bodies are not permitted in interfaces.
1112	A class may not extend itself.
1113	An interface may not extend itself.
1114	There is no interface defined with this name.
1115	A class may not extend an interface.
1116	An interface may not extend a class.
1117	An interface name is expected after the implements keyword.
1118	A class may not implement a class, only interfaces.
1119	The class must implement method methodName from interface interfaceName.
1120	The implementation of an interface method must be a method, not a property.
1121	A class may not extend the same interface more than once.
1122	The implementation of the interface method doesn't match its definition.
1123	This construct is available only in ActionScript 1.0.
1124	This construct is available only in ActionScript 2.0.
1125	Static members are not permitted in interfaces.
1126	The expression returned must match the function's return type.
1127	A return statement is required in this function.
1128	Attribute used outside class.
1129	A function with return type void may not return a value.
1130	The extends clause must appear before the implements clause.
1131	A type identifier is expected after the :.
1132	Interfaces must use the extends keyword, not implements.
1133	A class cannot extend more than one class.
1134	An interface cannot extend more than one interface.
1135	There is no method with the name <methodName>.
1136	This statement is not permitted in an interface definition.
1137	A set function requires exactly one parameter.
1138	A get function requires no parameters.
1139	Classes may be defined only in external ActionScript 2.0 class scripts.
1140	ActionScript 2.0 class scripts may define only class or interface constructs.
1141	The name of this class, <A.B.C>, conflicts with the name of another class that was loaded, <A.B>.
1142	The class <ClassName> could not be loaded.
1143	Interfaces may be defined only in external ActionScript 2.0 class scripts.
1144	Instance variables cannot be accessed in static functions.
1145	Class and interface definitions cannot be nested.
1146	The property being referenced does not have the static attribute.
1147	This call to super does not match the superconstructor.
1148	Only the public attribute is allowed for interface methods.
1149	The import keyword cannot be used as a directive.
1150	You must export your movie as Flash 7 to use this action.
1151	You must export your movie as Flash 7 to use this expression.
1152	This exception clause is placed improperly.
1153	A class must have only one constructor.
1154	A constructor may not return a value.
1155	A constructor may not specify a return type.
1156	A variable may not be of type void.
1157	A function parameter may not be of type void.
1158	Static members can be only accessed directly through classes.
1159	Multiple implemented interfaces contain same method with different types.
1160	There is already a class or interface defined with this name.
1161	Classes, interfaces, and built-in types may not be deleted.
1162	There is no class with this name.
1163	The keyword <keyword> is reserved for ActionScript 2.0 and cannot be used here.
1164	Custom attribute definition was not terminated.
1165	Only one class or interface can be defined per ActionScript 2.0 .as file.
1166	The class being compiled, <A.b>, does not match the class that was imported, <A.B>.
1167	You must enter a class name.
1168	The class name you entered contains a syntax error.
1169	The interface name you entered contains a syntax error.
1170	The base class name you entered contains a syntax error.
1171	The base interface name you entered contains a syntax error.
1172	You must enter an interface name.
1173	You must enter a class or interface name.
1174	The class or interface name you entered contains a syntax error.
1175	variable is not accessible from this scope.
1176	Multiple occurrences of the get/set/private/public/static attribute were found.
1177	A class attribute was used incorrectly.
1178	Instance variables and functions cannot be used to initialize static variables.
1179	Runtime circularities were discovered between the following classes: %1
1180	The currently targeted Flash Player does not support debugging.
1181	The currently targeted Flash Player does not support the releaseOutside event.
1182	The currently targeted Flash Player does not support the dragOver event.
1183	The currently targeted Flash Player does not support the dragOut event.
1184	The currently targeted Flash Player does not support dragging actions.
1185	The currently targeted Flash Player does not support the loadMovie action.
1186	The currently targeted Flash Player does not support the getURL action.
1187	The currently targeted Flash Player does not support the FSCommand action.
1188	Import statements are not allowed inside class or interface definitions.
1189	The class <A.B> cannot be imported because its leaf name is already being resolved to the class that is being defined, <C.B>.
1190	The class <A.B> cannot be imported because its leaf name is already being resolved to imported class <C.B>.
1191	A class' instance variables may only be initialized to compile-time constant expressions.
1192	Class member functions cannot have the same name as a superclass' constructor function.
1193	The name of this class, <ClassName>, conflicts with the name of another class that was loaded.
1194	The superconstructor must be called first in the constructor body.
1195	The identifier <className> will not resolve to built-in object <ClassName> at runtime.
1196	The class <A.B.ClassName> needs to be defined in a file whose relative path is <A.B>.
1197	The wildcard character * is misused in the ClassName <ClassName>.
1198	The member function <classname> has a different case from the name of the class being defined, <ClassName>, and will not be treated as the class constructor at runtime.
1199	The only type allowed for a for-in loop iterator is String.
1200	A setter function may not return a value.
1201	The only attributes allowed for constructor functions are public and private.

Using the Debugger

There will be times when you will need to simply walk through your code. You can use the Debugger panel to help you do this.

The debugger is part of the Development panel (select Window ‡ Development Panels ‡ Debugger).

The role of the debugger is to throw information about the events of a movie. You can run the file and collect the information and review it at the end of a test, or you can select break points during the movie. If you select the line number on the left side of your code in the Actions panel, you will add a red circular marker. This is a break point. When you run the debugger, the movie will stop when you reach the break point. Adding multiple break points allows you to fine-tune where your bug or error is located. This is called "stepping through your code."

Through better error-handling by the new placement of the Output panel, the ability to use exceptions, and new support for error messages, you can now control errors in your Flash movie's code more effectively.

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