Thanks for your suggestions. The error happened when I started the upgrading online. I did not do the database backup the way you suggested. I reinstalled v3.3.2 and then move the database directory directly. It worked with the old database.
Today I encountered a different error when I tried to shut down and restart cryoSPARC after running for 3 weeks.
command_core: ERROR (spawn error).
Is there anything to do with the “out-of-memory” errors I have encountered in the past two days in 2D classification?
Thanks for your thoughts.
Qiu-Xing