OMNet++:Error in display string of node :can't use non-numeric floating-point value as operand of +?

01 January 2019 0 10K Report

I'm running the Routing example with Randomgraph.ned Error shows : (1) Error in display string of node :can't use non-numeric floating-point value as operand of + (2)Error in display string of a connection : 17 args expected What is the cause of this problem?How can I solve it.

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