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How to get gata of previous time step

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Old   November 29, 2012, 00:18
Exclamation How to get gata of previous time step
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I am trying to define a source to a cell zone. The source is a function of temperature of the previous time step. I wrote the UDF as follows:

include "udf.h"
real x[ND_ND];
real source;
real tem1;
return source;

I was able to interpreted or complied the UDF and loaded it and defined to the cell zone. however, when trying to run Fluent, It gave the information:
FLUENT received fatal signal (ACCESS_VIOLATION)

Can anybody help me to solve this problem?

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