Code resource lock error (Error 455)

This error can only occur on the Macintosh. When you access a code resource, you must lock it. This error has the following cause and solution:

  • A call was made to a procedure in a code resource. The code resource was found, but an error occurred when an attempt was made to lock the resource.

    Check for an error returned by Hlock, for example, " Illegal on empty handle" or " Illegal on free block".

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