When trying to use vroom to solve a problem with ~200 tasks, I get an odd error:

{"code":1,"error":"basic_string::substr: __pos (which is 18446744073709551615) > this->size() (which is 465)"}

Looks to me like maybe the index into the string is going negative and overflowing?

This maybe the result of trying to use the public project-osrm server with too many tasks, but I was hoping that vroom would intelligently break the duration matrix into chunks so that it wouldn't overflow the API limits. In any case I think this specific error should probably not be happening.

I'm still trying to get it working locally to see if it's a problem there. The OSRM documentation leaves a lot to be desired.