Internal Exception
First fix
Try to update to the latest ProtocolLib and if you use ViaVersion also update it.
Second fix (if required)
Internal Exception: io.netty.handler.codec.DecoderException: java.lang.IndexOutOfBoundsException: index: 5, length: 13632 (expected: range(0,30))

Open config.yml
of ItemsAdder and change this value to false
: optimized-packets: false
config.yml
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