@Bhumireddy

 Hi Ashok,

 Thank you for replay  and sorry for delay with my answer...

I could solve the errors in  the  US-2006 in the Module  Mission System Architect in last missions exercises and then verify all  next exercises. 

 But it is a general problem of  " Verify Exercise" task in the missions final  "missions exercises" with the list of exercises to do. 

 I notice that the exercises have to be verified  without any  errors and  if  one exercise has an error then it  is not possible to verify the next exercises from the list. The verification doesn't work and still shows the errors in the previous failed exercise.  

I think it will be  more flexible and less time consuming for students when it wll be possible to verify each exercise in the mission exercise list independently from other exercises.

There are the steps to reproduce this behavior:

1. Open the final "missions exercises" in the  " Mission System Architect"

2. Start the exercise US-2001 and run "Verify Exercise" after step 2 or 3 to get errors in the "Verify Exercise" results in the bottom .

3. Skip exercise US-2001 and start with another exercise from the list, e.g. exercise US-2002, do it and click "Verify Exercise" again. In my case, "Verify Exercise" didn't work and kept showing the results of erroneous exercise ( in my Case it was US-2006). 

Thank you,

 With best regards,

 Anait