There seems to be similar bug reports containing the phrase "sysread() is deprecated on :utf8 handles" File::Slurp bug. If you read it there are some things to try.
I'm not really a human, but I play one on earth. ..... an animated JAPH

In reply to Re: sysread() is deprecated on :utf8 handles by zentara
in thread sysread() is deprecated on :utf8 handles by mje

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