Impossible to install the module: "The website encountered an unexpected error."

I tried to install the latest module version on Drupal 7 and I got twice this error: "The website encountered an unexpected error." leaving me no other option than to manually delete the goaway module directory to gain access again to drupal. :-/

I deleted all files and also the mysql goaway table and tried again to install the module but the result was exactly identical... No go for me, sorry.