Hi,
I come across same issue. I got the solution and want to share.
Some entries in database for the module creating this issue.
When I install same module on another prestashop instance with different database, I do not get this error.
So the problem was not in module.
PrestaShop Tutorials Videos [How to do Tasks]
https://www.prestashop.com/forums/topic/907438-prestashop-tutorials-videos-how-to-do-tasks/