Hi @LiyingXie, sorry about that. I forgot to mention we've recently updated RESCRIPt to work with QIIME 2 version 2021.4
and later. You can pick from one of several prior release versions of RESCRIPt, which often match the associated QIIME 2 version.
Since you are running QIIME 2 2021.2 you can install the appropriate version of RESCRIPT via the following command:
pip install git+https://github.com/bokulich-lab/RESCRIPt.git@2021.2.0
Let us know if this works for you.
-Cheers!
-Mike