Spelling Check Error - Type Mismatch

I had been using spelling check in Solidworks drawing. However, recently, I couldn't use it anymore. Every time when I tried to use it by pressing F7, it showed "Type Mismatch".

I have tried to reset the setting. 

I also ensured the dictionary is using swengineering.dic, and added the location folder of this file in the spelling folder through Optional.

However, nothing helped.

Did anyone encounter similar situation before and know how to fix it? Please land a hand! Thank you very much!