If you can upload the .fzz file (upload is 7th icon from the left in the reply menu) I’ll have a look. The most likely cause is a corrupted part. It may be not the .fzp file but one of the svg files that is missing, as I recall the error message calls all of them the fzp file. Currently the PCF8574 is in core parts, if that wasn’t true when the .fzz was created there will be a version in the fzz file which may be what is corrupted. Also I assume you mean version 0.9.3b above (AFAIK 0.98b doesn’t exist). Assuming this is causing Fritzing to hang, you may want to try the 0.9.4 prerelease version on github, as the bug that causes the hang is fixed in that (along with clearing the files from part creation by the parts editor.)
Peter