I'm trying to hit the following endpoint, but am getting Internal Server Errors (HTTP 500 Response):

sloprovisioning/symmetrix/{symmetrixId}/storagegroup/{storagegroupId}

The error message isn't much help:

"No Error message specified"

This problem is specific to this endpoint and only comes up with certain storagegroupId values (roughly 20 percent of all of these values). Why might this be and how could this be resolved?