object 'Dim_validate' not found

Hi,
 Thanks for your work! When I was running your Firm command on R, I encountered this problem:
<img width="967" alt="截屏2023-08-11 15 36 17" src="https://github.com/mingjingsi/FIRM/assets/69130971/a986482a-bb56-4d38-a2db-da03c10480c5">
Could you figure out what the problem is? Thanks again.