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I always get the following error message when I try to add a code field to a content type in the section 'Manage display':

An AJAX HTTP error occurred. HTTP Result Code: 500 Debugging information follows. Path: /MYSITE/?q=admin/structure/ds/ajax/add_field/custom_field StatusText: Service unavailable (with message) ResponseText: PDOException: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away in variable_set() (line 971 of C:\wamp\www\MYSITE\includes\bootstrap.inc).

How can I solve this?

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This usually happens when the max_allowed_packet value in your MySQL configuration (my.cnf file) is set to a low value. Increase the value (to, say, 24M), reboot your MySQL and give it another shot. Depending on your site & server, you may need a higher or lower value.

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