Ladybug worked fine but suddenly I get this error No module named ladybug.futil

I installed ladybug 1.1.0 and it worked fine but suddenly today I get this error 1. Solution exception:
Failed to import ladybug:
No module named ladybug.futil
I made sure I did step 4 correctly and the username of the account I’m using on this computer doesn’t have a space
I re-install ladybug again but unfortunately I see the same error
I don’t know how can I fix it and I would appreciate if you could help me.