Invalid pal header

I have installed the trial version of Natural One for testing purpose and started my first program. It’s a simple program - no databases, files, etc. Just a screen prompt and display,

When I try to run it, I get this error:

java.io.IOException: Invalid pal header (possible reason: client runs with SSL/Server without SSL or vice versa)

Reason: network problem encountered

How to fix this error?

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