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+# Troubleshooting
+
+**Assertion failed: fp != NULL, file \<filename\>, line \<linenumber\>**  
+PISA modules communicate using the file system.  Some anti-virus software scans the contents of files before read and
+after write operations.  This may cause one of the PISA communication files to become inaccessible and cause this error.
+To test if this is the cause, try disabling your anti-virus and re-run the program.
+  
+A more permanent and secure solution involves adding an exception to the anti-virus software to prevent active
+monitoring of PISA communication files.  For example, first add the line
+```
+java.io.tmpdir=<folder>
+```
+to `moeaframework.properties` and set `<folder>` to some temporary folder where the PISA communication files
+will be stored.  Then configure your anti-virus software to ignore the contents of `<folder>`.