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read saved case and data error

Hi.
I am running an unsteady combustion problem with the eluerien multiphase model. In the middle of the simulation I save some case and data files to use it subsequently. But when I try to read the saved case and data file I get error message:
In the first iteration “fluent” return this message: Error: floating point error: Invalid number.

P.S: I’m using an UDF in my simulation.

Thanks in advance.