'Getting an internal error while executing code on IBM CPLEX

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.

cplexopl


Solution 1:[1]

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.

Solution 2:[2]

In this case, the problem can be solved in one of two ways:

  1. Bring the files to the local file of the project
  2. Adding the path when writing the code

For example:

SheetConnection my_sheet("D:\\Education\\largertestregion.xlsx");

Sources

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Source: Stack Overflow

Solution Source
Solution 1 Monu
Solution 2 zephryl

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