it looks like you supplied text input in some action(s) where there is expected numeric (double) value.

The major problem is that even I tried to restored the old version, the new changes should be discarded, but the same error still exist when I want to publish an older version.

The changes I made recently can be discarded, I just want to restored back to a workable older version.

I followed the step to open the older version in this post.

is it a list workflow?

haven't you changed datatype of a field in list the workflow is running on?

or in some other list that the workflow may work with (eg. query list, update items, etc)?