Error message when publishing

Hi all, 

I'm trying to publish a storyline file from 360 and I'm getting an error message saying that access to the path ".... - Storyline output\story_content\thumbnail.jpg is denied". I have published other files recently and it has worked. It seems to be a title screen thumbnail generated by Storyline by looking at other published courses but I don't know why the access would be denied.

Assistance would be appreciated

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