Not able to create SubTree

[roboticist8]

Not able to convert the action node into a subtree, I am getting the following error,

terminate called after throwing an instance of 'nonstd::expected_lite::bad_expected_access<std::__cxx11::basic_string<char, std::char_traits, std::allocator > >'
[bt_engine-1] what(): bad_expected_access
[ERROR] [bt_engine-1]: process has died [pid 9688, exit code -6, cmd '/home/ubuntu/ROS_WORKSPACE/groot_ws/install/behavior_tree/lib/behavior_tree/bt_engine --ros-args -r __ns:=/ --params-file /tmp/launch_params_36siidp2 --params-file /tmp/launch_params_v2mm0yz6'].

I have tried subtree as well as subtreePlus, but it's not working for any template of a behaviour tree,

Any Suggestion?