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The org/bitbucket/cowwoc/diffmatchpatch/DiffMatchPatch class is provided by the diff-match-patch-1.2.jar library in the Lightstreamer\lib\core folder.
Please check if you can see it.
If you can't,...

Hi, Also in this thread, I can't but refer to this other thread of yours and in particular to post #4.
To resume, if you open a command prompt from the "Lightstreamer" folder of the Server...

The "Unexpected error in initialization phase:" should be followed by the actual error message.
Do you see anything after that line?

The previous message, "No com.lightstreamer.kernel_lib_path...