luceos Thank you for your suggestion. I successfully rolled back from beta14 to beta12. When I rolled back to beta13, the composer error message could only be rolled back to v0.1.0- Beta.12, v0.1.0-beta.3, v0.1.0 -beta.5, v0.1.0-beta.8,
I changed all the v1.0.1 in composer.json to v1.0.1-beta.12, then ran composer update in ssh, and successfully rolled back to the beta12 version. Now I only need to upgrade the beta12 version to the beta13 version.