Hello @yjiakang,
Welcome to the QIIME 2 forum :qiime2:
I am not 100% sure what your error is. however, I have found this forum post that has the same error occur.
The problem there was that they were using shotgun metagenomic data instead of amplicon data (dada2 is designed for amplicon data). What kind of data are you working with?
I hope that helps!
Chloe 