THE umap file makes crash

Yesterday I added some plugin nodes into my main level BP ‘map1.umap’

after that the ‘map1.umap’ file makes crash again and again ,

How can I fix this problem, removing plugin not working,

I don’t want to remove the ‘map1.umap’ because the level has many important things on my project.

I should eliminate some selected nodes which cause problems but even I can’t open my project.