Ensure that the MySQL Host is correct. By default it is set to "localhost". If this is incorrect, you can update it by opening c7/data.pl and c7/setup.pl and editing the $MySQL_Host field, located near the top of the file.

How to edit this field:

1. $MySQL_Host = "localhost";

2. Only edit what is located between the quotation marks. Therefore if your server host is "some_hostname", then you would edit it as follows:

3. $MySQL_Host = "some_hostname";