workflow stuck in running stage

[bharatij]

Hi,
I recently started using AGC. I tried GATK's cram-to-bam and my custom workflow but both workflows got stuck in the Running stage forever until I terminated them. I checked the engine logs for both workflows and I found the following error message.

1. cram-bam workflow
   Docker lookup failed
   java.lang.Exception: Registry public.ecr.aws is not supported

2)my custom workflow
Docker lookup failed
java.lang.Exception: Registry #########.dkr.ecr.us-east-1.amazonaws.com is not supported

My AWS ECR works with other applications so I think its only having issue with AGC. So I am wondering is there any settings I am missing?
Thanks,
Bharati