My nopCommerce 4.2 work before and I have set all permission for all.
But few days later , it crash. Then I try install other kind web app eg. blogEngine and other.
It have same error. So I ask my host provider about this web directory is dead or not.
Then they reply me yes, this web directory is and it can't install web app.
So they re-create IIS for me to solve this problem.