The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator, webmaster@a2z.viper.enta.net and inform them of the time the error occurred, and anything you might have done that may have caused the error.
More information about this error may be available in the server error log.
[Wed Feb 03 10:52:45 2016] [alert] [client 84.45.194.33] /usr/webspace/www.eagleye.bi z/invoice/.htaccess: Invalid command ‘\xef\xbb\xbf’, perhaps misspelled or defined by a module not included in the server configuration
I don’t even see that command in the htaccess file !!
This error occurred because of the editor you used to edit your .htaccess file.
Please try another editor or disable the .htaccess file as it’s not necessary for the app to run.