Mail Merge Reports

Regarding Mail Merge Reports, I tested the basic Version before purchasing the pro version, and it worked fine, I uninstalled the basic version and then I installed the pro version and when I navigate to the Configuration Page in the Administration Panel, the console is showing "index.php:1763 Uncaught SyntaxError: Unexpected token :" and everytime I save it I get "index.php?module=DHA_PlantillasDocumentos&action=Configuration:1433 Uncaught TypeError: SUGAR.saveTemplatesSettings is not a function at HTMLInputElement.onclick (index.php?module=DHA_PlantillasDocumentos&action=Configuration:1433)" I cannot save the configuration page and the 'Enabled Modules' Multi-select is not appearing. Any idea what could be causing that, I already did a Quick Repair and Rebuild.