'DLL Error Following the tutorial for gtkmm

I'm following the gtkmm tutorial for gtkmm4 and I'm getting an odd error when I try to run my program. The program is an exact copy of the provided code, and it compiles successfully: enter image description here

However, when I run the program it gives me a series of errors: enter image description here enter image description here enter image description here enter image description here

I'm not sure what to do at this point. I've tried googling, but I don't get anything helpful. I've check that the DLL in question does exist. Any advice is appreciated!

Edit: I ran the Dependency Walker program, and got some errors, not sure what this means though.

enter image description here

Edit2: I did some research on Dependency Walker, and it seems to have some known issues, so I also ran lucasg's "Dependencys" program, with this output. I'm still not really sure what this means, but it seems fine.

enter image description here

Edit3: I moved the 4 offending dll files into the build directory, and these are the new errors I'm getting. Its the same error, but now it points to the more local file.

enter image description here enter image description here enter image description here enter image description here enter image description here

c++mingwgtkmmmsys2


Solution 1:[1]

Check your .exe file with Dependency Walker to see which issues there are loading the .dll files.

One possible cause could be that you're mixing 32-bit and 64-bit.

Solution 2:[2]

The issue was something to do with finding the correct DLLs. The solution, as outlined here, is to copy all the DLLs from C:\msys64\mingw64\bin into the build directory. Then, using ntldd or some other profiler, determine which DLLs are unnecessary and remove them.

Sources

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Source: Stack Overflow

Solution Source
Solution 1 Brecht Sanders
Solution 2

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