though i can get galaxy forge to run, how do i make it incorporate mods that introduce new planet types?

for developer.exe and particale forge, it says that it has encounterd a problem and needs to close. it gives no hint as to what the problem might be and when i check the website provided to see if there is a solution it says there isn't any. i know there is a solution otherwise no one would be able to use it at all. any sudjestions for them?