Render error codes

Hello does anyone know what these codes mean.

gbl Error 13686ms> RENDERCORE ERROR?: GL Render Target does not have an FBO attached to it. Intended?
lantern Error 21435ms> [init] rtGlobalSetAttribute failed with result code 1546

I am trying to render a 7680 x 4320 at 150ppi scene. (I have never had issues with rendering this big before) With a highly detailed character right in the middle and it keeps failing.

Can anyone help? Thanks.