Issue:

Scripts execution permissions are a major concern in Perl language.

How to solve:

The files you upload to your server can have up to 3 permissions combined: read, write and execution. 

You must set the permission of the file, with your FTP program, to 755 to execute the perl script. 

Ask your web hosting provider about specific procedures with your webserver. 

Check with your FTP program about a command "Set permission" or similar.