Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String java.lang.String.toLowerCase ()' on a null object reference at ...

Please check the output or the logfile with warnings and errors for hints. 2021-02-03T10:19:46,105 ERROR MatsimRuntimeModifications:100 ERROR --- results should not be used for further analysis.

ERROR: NullPointerException encountered while trying to adding String to Deque that is set to null. java.lang.NullPointerException INFO: Successful at adding String to Deque that is set to null ...

Then there’s the NullPointerException. Null pointer exception is an “exception” (error) that is particularly common when programming in Java.