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The mismatch value from sysmsm should be approximately less than 10. For a small network, the value is often less than 1. For a large network (thousands of buses) up to 5 might be common. If you get a value in the thousands or greater, the loadflow solution is very bad. To me, it is very good practice to consider the system mismatch to check that the results are valid.
If you are getting the message to run TREE, then you need to run TREE to switch off the isolated buses before running a load flow.
