DS_Store in published file

I have a banner ad that i've created for my company, with a clickTAG that I implemented.

Upon submitting the banner, it came back with this error:

"The following file needs to be removed from your HTML5 asset because the file type is not supported for HTML5 creatives:
HarpoonDIGITAL_728x90/web/._.DS_Store.
Reach out to the creative developer to resolve this issue.9009"

I'm not seeing the file in the published folder, or on my computer period. Does anyone know how I could go about removing this from what i'm trying to submit?

Thanks

M