I have just encountered this error too while trying to import csv files using the plugin.
My site uses PHP8.1.
FWIW, I imported three files (events, organisers, venues) and I noticed that one line was getting dropped from each, and it was/is always the same line; line 7. Leaving that line blank in your csv file seems to be a temporary workaround. I have only tested this up to ~11 entries in a CSV file as I am evaluating whether to use Events Calendar Pro for a bigger job. I will report back if I encounter this error at other lines in larger files.
Hope this helps someone.
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This reply was modified 2 years, 7 months ago by jameskb101.