[Solution Found In Replies]!}Massive BlackBox Level Loading Error

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Recently I having this massive error with my mod.
At the end of one level, there is your typical Level Door to transit to the another level.
Every time I use this Level Door it starts loading the next map but it stays on the loading screen for a good while until a blackbox error shows up.
I try loading up the map that was attached to the Level Door through the Main Menu, it works perfectly as intended, no blackbox errors. This is stressing me more than it should, that transition between those 2 levels also happen to be where the first 2 acts of the game join up and it is preventing me from playtesting a good vertical slice of the game.
I have found no helpful solution to this problem on this forum, so if somebody is willing to help, just respond with a possible solution or just say you want help and I'll send you the hpl.log file.

Any actual help is greatly appreciated.