The reason is because there is a difference in an accepted parameter between previous version and current upgraded version.
The total sample (Traffic Analyzer - High Resolution Stream Block Sampling) is always limited to 1000, but the Spirent TestCenter allows the user to go above 1000.
Resolution:
Open the configuration in the earlier release and change the Total Sample to 1000 in "Traffic Analyzer - High Resolution Stream Block Sampling" and save it. Now we will be able to load the configuration file in later release.