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Got an ClassDefNotFoundException

It very likely indicates you updated but not following the documentation.

The mistake you probably did was to backup your.jnlp (or .php) file and restored it after the update. If the new version includes new libraries, they are then erased from the.jnlp when your restore the original one hence the exception.

You should never overwrite a .jnlp with a backuped version as this is hidding possible necessary changes. Instead, just edit the new .jnlp and edit it to update the codebase attribute (that you can copy from your backup).

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