We tried to print via ERPNEXT apps and got the following error.
IOS : Doesn’t shows any respond after press on Print / PDF / Full page button.
Android : Same Error message occurred as you demonstrated.
So we moved on and tried another page (clean from scratch) via the App and carried out the same result.
We further moved on and try to login via internet browser from our phone and we are able to print out the PDF File. I think this error only appear when you try to print via ERPNEXT APP .
Anyone facing the same issue ? please let us know why is this happening.