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The Server doesn´t find files.
When you run a process on Server make sure that you have set all paths relative and not absolute.
The solution is quite simple. Please open the process you run on RapidMiner Server and check the process location for the Execute Process Operator. It probably looks similar to the one in the screenshot.
Now click on the folder icon, uncheck and check again the box "Resolve relative to...". Now the location parameter should change.
In order to prevent this from happening again in the future it is Best practice to immediately store a new Process before you enter the first Operator. Then the process locations are automatically set correctly.