Fork join threads in a sequence body

UVM
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3

In reply to dave_59:

You were right, sequence construction was not inside. I did move it inside. But it didn’t change anything. The ob_agent_num generated were unique(they were 5) and none repeated. So, it didn’t make any difference to the simulation. Probably I need to debug is further.

I did try below code,

begin 
                  your_sequence_base seq;
		  a = ....;
		  b = ....;
		  ob_agent_num = $urandom_range(0,7);
                  $cast(seq,ob_seq[ob_agent_num].create_object("");  
		  seq.randomize;
		  seq.start(p_sequencer.ob_agent_sequencer[ob_agent_num]); 		  
	       end
``` verilog






But it reports, " Null object access, The object is being used before it was constructed/allocated"  at below line. Do I have to specify anything in those quotes or anything is missing?
                  $cast(seq,ob_seq[ob_agent_num].create_object("");  


 There is always something to learn from your posts. Thank you!