Hi, I was getting the same screen when trying to install htmlmail 0.0.7. I am running mantis 1.1.6 and I have others plugins installed (HelpLink).
I have solved the problem. I didn&
#039;t have the permissions to write and execute to files in mantis/core directory. For the installation preriod I have changed the permissions to:
chmod 767 *.*
and when the installtion successfuly ended have returned to old configuration of permissions in mantis/core directory:
chmod 644 *.*
It worked for me.