A dynamic link library (DLL) is a library specified in the Lib clause of a Declare statement. This error has the following causes and solutions:
If the file is a source-text file, it must be compiled and linked to DLL executable form.
Obtain the Microsoft Windows DLL equivalent of the file.
Obtain an updated version of the DLL.
Obtain the referenced DLL and make it available to the other DLL.
Move the DLL to a referenced directory or place its current directory on the path.
For additional information, select the item in question and press F1 (in Windows) or HELP (on the Macintosh).