When trying to syntax check the linked model the following error message is given: "com.uppaal.engine.Exception: java.lang.NumberFormatException: For input string: "4294967088"" The real problem in the model is that en IO specification is given for a process that is not part of the "system" definition.
Could not replicate the issue in Uppaal TIGA 4.1.19-0.17 Perhaps it has been fixed. Feel free to reopen if it persists.