Why behavior tree get struck in move to?

i use the AI behavior toolkit. And i have placed 50 AIs in my scene, it works well.But if i place one more,then there is one of those 51 AIs will not move.That means only 50 AIs in my scene will work good, others doesnt work.please forgive my poor English, thank you.

Hi! Edit → ProjectSettings → Engine → CrowdManager → MaxAgents. Default value is 50.

thank You!!!!!