Unresolved externals

For single .exe applications: make sure that in your global settings, entering the "File Control" tab, in the "File Attributes" section, you do have the "External" set to "None external".

For multi-dll applications, make sure to compile the data-dll before the one that gives you the error. Make sure that in the data-dll, entering the "File Control" tab, in the "File Attributes" section, you do have the "External" set to "None external".