Qualifier must be collection

The use of an exclamation point between two identifiers is specific to collections. This error has the following cause and solution:

• You used a name on the left side of the exclamation point (!) that isn't the name of a collection.

  If the name is supposed to represent a collection, check to make sure the name is spelled correctly. Note that the exclamation point is also the type-declaration character for the Single data type. If the name in question isn't supposed to be a collection, perhaps the ! type-declaration character appended to a variable name has been concatenated with another name.

For additional information, select the item in question and press F1 (in Windows) or HELP (on the Macintosh).