... File . Read sets . ... Read one or more data sets. ... Read from: sets the source of the data, either a disk file or a pipe. ... These errors generally arise when an attempt is made to read a text file - xmgr relies on the interpretive capabilities of sscanf() to parse the data. xmgr will read data sets until there are no more sets available, after the maximum number of sets have been used, you'll need to free some sets using the [Kill] or [Kill all] items in the Edit/Set operations pullright. ...