You have multiple versions of perl installed, with different sets of modules available. (Your 5.26 has Sereal but your 5.14 does not.) This is causing Devel::Cover to try to use different database formats for different runs, which of course are incompatible. Try setting the environment variable DEVEL_COVER_DB_FORMAT to either "JSON" or "Storable" to force a consistent database format.

In reply to Re^5: Creating coverage big report by jcb
in thread Creating coverage big report by ovedpo15

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