W072 is not listed but too narrow of plane means the block is too thin or you have 2 blocks in the same space ( like you duplicated a block and left it right at the same location of the orignal block, usualy get a W074 for a dup block though))

most W07X errors are duplication errors

WARNING W010: Vertex out of plane
The compiler does not like the shape of a particular block. Mostly harmless

( snap to grid and make sure faces are aligned to the level axis(s))

WARNING W110: Misplaced portal
An internal error occured that could lead to a clipping problem in the level at a certain place. Mostly due to block errors that were indicated in previous warning messages. Mostly harmless

( usualy due to 2 surfaces competing with eachother, a block too thin or block faces at unusual angles that are difficult for BSP rendering)