@ngdoc error
@name $compile:iscp
@fullName Invalid Isolate Scope Definition
@description

When declaring isolate scope the scope definition object must be in specific format which starts with mode character (`@&=<`), after which comes an optional `?`, and it ends with an optional local name.

```
myModule.directive('directiveName', function factory() {
  return {
    ...
    scope: {
      'localName': '@', // OK
      'localName2': '&attr', // OK
      'localName3': '<?attr', // OK
      'localName4': ' = attr', // OK
      'localName5': ' =*attr', // OK      
      'localName6': 'attr',    // ERROR: missing mode @&=<
      'localName7': 'attr=',   // ERROR: must be prefixed with @&=<
      'localName8': '=attr?',  // ERROR: ? must come directly after the mode
      'localName9': '<*'  // ERROR: * is only valid with =
    }
    ...
  }
});
```

Please refer to the {@link ng.$compile#directive-definition-object
`scope` option} of the directive definition documentation to learn more about the API.