Getting 500 error when attempting to generate data

I'm unable to see any debug logs, but I get the following error when I run the command (where 123456 is my schema ID):

`sfdx testdata:generate -s 123456 -f csv -c 10 -d export/gendata`

The error returned is:

`ERROR running testdata:generate:  Internal Server Error.The status code of response is 500`