Evaluation was cancelled

Hello Community,

I built a dataflow and it worked perfectly. However, It has run into an issue - evaluation was cancelled. I checked several posts from forum, and I learned the issue has something to do with memory, so I need to raise the CPU. My question is if that is only a cause; To raise the memory, do you mean to raise CPU for a entity, a dataflow, or a workspace? By the way, my workspace is premium. 

Thank you for any thoughts

Best, Qianru