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If this error message occurs at the beginning of the run, without any fault applied, then chances are the dynamic set up is corrupted. Pick up the original case, solve it, add dynamic data and perform a no-disturbance test. You should get flat lines for all channels with deviation error smaller than 1e-2. You can also applied a fault and clear it with no tripping of network elements (ringdown test)

If this error message occurs after a fault was applied, then check if the fault has been cleared! Otherwise, the case is in 'collapse' mode unable to converged. Try to run with a less severe fault (lower the fault time or minimum tripping of network elements) until you get a proper run without such message.

Let us know what you find.