In reply to bmaassar:
Your out_pkts should come from one or more minitors observing the traffic and putting the extracted data using the write or a put method. In the scorboard you have to perfrom gets on the analysis_fifos and compairing your data. I believe your approach for generating the scoreboard data is not clean.
One indication is shown in your log-file:
[SCOREBOARD: Read a packet out[0]:]
means there are no data avalable. You are perfroming the non-blocking try_get. This is your problem. Using the blocking get might solve your problem.