I already fixed this, I just wanted to create this because I haven’t found anything on how to fix this. What was happening was I converted a blueprint project and converted it to C++ and it was working at first but when I came back to it later the engine was not seeing the C++ class and the blueprint class I re-parented to a C++ was giving an error saying that it was not derived from any class. When I would make any changes in C++ or remove a plugin it was not applying.
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Open your .uproject file in a text editor and add this right under description.
"Modules": [
{
"Name": "PROJECT NAME (keep the quotations)",
"Type": "Runtime",
"LoadingPhase": "Default",
"AdditionalDependencies": [
"Engine",
"CoreUObject"
]
}
],