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Help! UM3 Unable to process print

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I've just bought an Ultimaker 3. The first test print failed and I've only had one successful print, at all other times I get this error message. "An error occurred while processing this print job. Line nr=0." To start with the message appeared at different points through the print on different line nr but has now consistently been at line 0. I've tried updating firmware, resetting to factory settings and then updating firmware, other USB sticks, other stl files, reformatting USB's and updating Cura. 


After this error has occurred the UM3 ceases to read anything in the USB port until I restart the printer. 


I can't get on to the Wi-Fi or LAN connection to try any prints through there. 


Please help!!! 



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I've just updated it so whatever the most recent version is. I've added the UM3 to Cura it's on the correct settings because it's my only printer with the two nozzle set up. I have an UM2+ and a makerbot replicator 2 so I'm pretty confident I know what I'm doing. 

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I'm not sure but I think this means the first line in the gcode file is corrupt or isn't gcode.  I'd look at the gcode file in a text editor and see if the first line is messed up.  Maybe reformat the usb stick or try a different usb stick.


For networking it really helped me to have my router assign a fixed ip address to my printer - there is a DHCP section in the options for most routers and for me it was trivial as it already had an IP address and it said "ultimaker" next to it and I clicked one button to make it static.  I also wrote down the ip address and told cura connect about that ip address.  This seemed to help things work better.


Wait - wireless?  Are you wireless?  If so you have to use your cell phone to connect to the printers wifi service and tell the printer your wifi password so it can get onto your network - that might be the problem also (the network problem - not this usb issue).


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