Error: an invalid sql is used

[Sahaja]

I processed a feature class in FME to merge a table and exported it back to the feature class. Now, for some reason, I keep getting the error "An invalid SQL is used" when trying to open the attribute table. I checked for any invalid characters and spaces in the fields, file names, etc, and I couldn't find any error. However, when I open the same feature class in QGIS, I am able to open the attribute table. 

Here's the error details: 

Here's the same table:

Any leads would be appreciated. 

Thanks

[jcarlson]

When you "exported it back to the feature class", what does that mean? Have you overwritten the original layer, or simply applied edits to the existing layer?

[Sahaja]

Created a new layer, that didn't disturb the original one.