Getting an internal error while executing code on IBM CPLEX

0
votes

enter image description hereI am new to CPLEX. I wrote a few simple codes to solve some linear programming questions on optimization. It worked fine and I got the expected output (to make sure if there are no issues in installation ). I am trying to execute an existing code for CVRP. I am getting below error.

"internal error (Please notify IBM) CVRP Unknown OPL Problem Marker"

Kindly let me know if you need any specific information regarding it.

1
cplexopl
Is that the entire error message? Can you provide a Minimal, Complete, and Verifiable example? - rkersh
Actually, I'm asking the opposite. It would help if we can see the code that is failing. Otherwise, we're just guessing what the problem might be. Can you provide a minimal example that will produce the error? Is there anything under the "Engine log" tab (if so, please show the text, not an image)? - rkersh
I have attached the exact error message screen print in question. I will try to create a verifiable example. - Monu
thanks i got it . in engine log there is nothing , its blank !! - Monu
I was able to fix the issue, the issue was the part of the code which was fetching data from the local xls file, it was incorrect. However, when I increase the dataset , it to 16 hours to run to throw error message "Description Resource Path Location Type Exception from IBM ILOG CPLEX: CPLEX Error 1001: Out of memory.->. INSECVRP Unknown OPL Problem Marker " i was able to run the code on smaller dataset, do we need to do some settings ? - Monu

1 Answers

0
votes

It is not a solution but a workaround, you may try if a similar error occurs for you. I got the above error when I was trying to fetch data from local xls file using below code

SheetConnection my_sheet("largertestregion.xlsx"); time from SheetRead(my_sheet,"time"); demand from SheetRead(my_sheet,"demand");

As my data set was small, and I defined all data in my .dat file instead of fetching it from local xls. The issue got resolved. However, I am yet not sure how the above code did not work for me.