Can’t Rank up my veteran sicario

[Geîseriç]

Hi I was trying to rank up my veteran sicario from 3 stars to 4 stars and when I click nothing happen

 

[MrBakoBullyz]

Have to buy an offer of gold

 

[Mike Toreno]

Try to rank up ur regular Sicarios to Veteran ranks first.

Check ur items might be lacking..?