My current task is to create a customized theme for an Orchard site. To do this, I've downloaded and installed a theme from gallery in order to customize it later. That was successful. After that I tried to install Designer Tools module from Module Gallery.
During the install an error occured. And after that event I cannot reach the listing themes function neither from the Dashboard nor from orchard.exe command line's "theme list" command. The output of the "theme list" command is:
Also an error occurs when I click on Widgets menu item on the Dashboard: The page cannot be displayed because an internal server error has occurred.
What could be the solution for this? Thanks for the help.