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Suddenly Magento starts giving this error ... I tried to var_dump() what is missing, also check the file but there is no problem with it.
The error would suggest you've created a category attribute called Seconday Description and it is set as required.
Have you created this attribute?
Check the eav tables in db.
As how to solve. Depends. Do you want and use this attribute? You could delete it?
Required, but never shown