I have a Windows program that has been around forever, and I have just started to process of migrating from DF20.0 32-bit to DF24.0 32-bit and 64-bit

Still quite a bit of ground to cover, but I keep getting this error when the compile finishes and the program starts. It only happens with the 64 bit version, so might be one of the DLLS that I am in the process of weeding out. But just wondering if anyone knows what this could be. There are about 5 32 bit DLLS that I will be replacing, so my best guess is that it is one of those,

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