"could not be compiled. Try rebuilding from source manually."

[DanM]

@Patrick_Udom

The project ONLY used Blueprint and wasn’t created using C++

If you have a Binaries, Intermediate, and .sln file (and Source) then that would be very unlikely. Any of those I just mentioned wouldn’t be in a blueprint only project; as they all exist for C++ code.

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You’re probably running into this issue:

Compiling issue. UE5.3

Edit 2: There is a bug in MSVC 14.39 that effects UE 5.0 and 5.3. 5.4 also bans that version of MSVC. In 5.0 that would appear as errors regarding TStringConversion, use the instructions below to downgrade to 14.38. In 5.3, errors regarding FHazardPointerCollection, with the latest version of 14.39 this no longer causes that error on my end so updating Visual Studio should fix this. In 5.4 Epic has banned use of 14.39 so you would need to downgrade. You should only need to follow the steps be…