put it more clear:
the above first line error log (with prefeix):
java.lang.RuntimeException: Message size too large. Prefix mode can only work if both sides of the connection follow the 'prefix' protocol.
at anywheresoftware.b4a.randomaccessfile.AsyncStreams$AIN.run(AsyncStreams.java:205)
at java.lang.Thread.run(Thread.java:745)
and when prefix deleted I got the error: "too many parameter"