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I'm ripping multi-episodes DVDs of a TV series.
All went well until the fourth disc when I got this error message:

MakeMKV v1.9.0 darwin(x86-release) started
Debug logging enabled, log will be saved as /Users/mac/MakeMKV_log_1.txt
Optical drive "BD-RE MATSHITA BD-MLT UJ267AM 1.10d" opened in OS access mode.
DEBUG: Code 0 at !"'Su)+!?J*5w)UOIL@)g+YW\:121263153
Opening files on harddrive at /Volumes/Videos/1.SSME/03/VIDEO_TS
Calculated BUP offset for VTS #1 does not match one in IFO header.
Calculated BUP offset for VTS #2 does not match one in IFO header.
Title #2 has length of 75 seconds which is less than minimum title length of 120 seconds and was therefore skipped
Title #3 has length of 19 seconds which is less than minimum title length of 120 seconds and was therefore skipped
Title #4 has length of 19 seconds which is less than minimum title length of 120 seconds and was therefore skipped
Title #5 has length of 19 seconds which is less than minimum title length of 120 seconds and was therefore skipped
Title #6 has length of 19 seconds which is less than minimum title length of 120 seconds and was therefore skipped
DEBUG: Code 233 at zXTw/CgCbAaR0peq1Rs4+uV2:0
Failed to open disc

How do I fix this error?

First step is to follow the instructions in the FAQ link in my signature, and send the requested information to support@makemkv.com for analysis. The debug codes tell Mike about various things the program tried to get around strange things found in the disk analysis.