OutlookGen

I have been getting this error message for several weeks whenever I add a new
task. The save task order command is not available, but if I clicked close I
could add the task. Now, the system is no longer allowing me to save any
tasks. I get this message with the addition of one or more parameters are
incorrect and I cannot resolve it. I have tried:

copying all tasks to a new folder
running /cleanviews from the cmd prompt
running the outlook repair utility
working offline from my exchange server
uninstalling an add-in I was using

What can I do????

Sue