Pre-SAE injection poses will try to read the external files (delta, with the actual morph data, and chanvis, which make the morph dial visible) before they set the value of the dial: that's why it's looking for the files. You can either delete the readscript lines in the pose for those morphs or, somewhat easier if you have a lot of poses, create dummy files - empty text files renamed to match the delta and chanvis files for the expression morphs.