Error- Units Incompatibility

I tried combining 2 C2 files, then I got this message ERROR--Units incompatibility with.... When I checked the units for both files, they are different. So, I changed one of the file so they will have the same units. But still I'm getting this message. I double checked and they are the same units. Did I miss anything here? Pls help.

Dear JR Park,

I don't know if this will work. Please try to convert the unit of the model to the unit that you want by using Tools >> Convert Input to New Unit. I guess you did it manually from piping input which not cover all the units of the input item parameter.

Oh! It works! Thank you very much Mr. Manik.

HI ,

JR Park nice to meet you . are you from Malaysia ?

THANK YOU SO MUCH