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Hi Yujing,
Trying with 7.3.0 also results in the same error. Of note, running recon-all 7.3.2 without -T2/FLAIR and -T2/FLAIRpial flags works without any issues. However, I couldn't try recon-all in the 7.2.0 version (I can give it a try if you think it is necessary). As I said before, running recon-all using the flags above with 7.1.0 works fine, however, I noticed that pial surfaces estimated using T1s alone align far better than surfaces estimated with the addition of T2/FLAIRs.
Amir