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).