Cellranger error from strato --backend flag

[Adam Rubin]

Hello, 

I ran into an error using the latest Cumulus 2.6.3 cellranger where mkfastq failed at the first call of strato with the following error: "strato cp: error: the following arguments are required: --backend" It seems you dealt with a similar error in April: https://groups.google.com/g/cumulus-support/c/TGqz1OZgw3A/m/h_tq_k40AQAJ 

I seemed to have bypassed it by using cellranger_arc version 2.0.2 and reverting to Cumulus 2.6.0. 

Thanks a lot!

Best,

Adam