creating project folder failed


i have made three game with no problem, then when i fire up unity to create a new project i get this message

creating project folder failed

i have uninstalled and reinstalled unity. tried changing the path. nothing

please advise

short answer: your unity version is corrupted install it again or install another one
Long answer: the thing is that when creating a new project untiy hub asks the unity version to create becuase the project has to have a version but if the unity version is corrupted then it wont create anything