Explanation
The shift length is too short. This could be the cause of the error when trying to optimize the route with 124 customers. The shift length is the maximum amount of time that a user can work in a day, and it is set in the visit plan settings. If the shift length is too short, it may not be possible to visit all the customers within the time limit, and the optimization may fail. To avoid this error, the administrator should increase the shift length or reduce the number of customers in the dataset. This is explained in the Specify Visit and Optimization Parameters document.