We are trying to create IBM MobileFirst Container for bluemix by following the MobileFirst containers tutorial in : https://mobilefirstplatform.ibmcloud.com/labs/administrators/7.1/bluemix/
As per the tutorial/video we have created the MobileFirst Analytic server and trying to create MobileFirst server image using prepareserver.sh script in which it gives me an error saying that repository/tag is not valid.
I tried creating the image using Dockerfile still i am getting the same issue.

cf ic namespace get. Also, please add the full command and error output in your question as a text, it would be much more clear than this cropped image. - Alex da Silva