I’m becoming increasingly frustrated with this issue. It’s appeared twice now, and it’s pretty much impeded progress both times. The issue is that sometimes, if I close a project and come back to it later, upon reloading the project, opening any Blueprint (or any map) will cause the whole Editor to crash and show this error message:
Assertion failed: bCustomPropertyListForPostConstructionInitialized [File:D:\Build++UE4+Release-4.17+Compile\Sync\Engine\Source\Runtime\Engine\Private\BlueprintGeneratedClass.cpp] [Line: 563]
I have no clue why this is happening. I save every file I’m working on every time to make sure that issues like this don’t happen. The first time, I managed to fix the issue by methodically removing files from the Content folder until it stopped crashing, then found that many Blueprint variables had somehow become corrupted. I spent hours adding references back, inserting links between nodes that had somehow disappeared and ticking checkboxes on some boolean nodes that had become unticked. I also did a thorough sweep of the project to make sure there were no circular references and combed through every file to make sure there was nothing that felt off.
I checked online for a definitive solution or prevention method, and nothing that was suggested worked. I tried backing up then deleting the Intermediate, Build and Saved folders and this didn’t solve the issue.
It’s just happened again. If anyone has a solution to this issue, I’d very much appreciate it because it’s a complete roadblock on my progress.