Compiler error in a BP

Trying to cook a map.
I get 2 errors which causes it to fail.
I have isolated the issue, but im not really sure why/what I should do to fix it.
Oddly i have not touch anything other then stuff you would normally would with designing a map, and this is error is in a bp for a tek piece?

[2018.03.24-22.44.04:139] 0]LogBlueprint:Warning: [compiler] Warning This blueprint (self) is not a HUDElementBarWidget, therefore ’ Target ’ must have a connection
[2018.03.24-22.44.04:140] 0]LogBlueprint:Error: [compiler] Error Variable node Set bBoostIconHidden uses an invalid target. It may depend on a node that is not connected to the execution chain, and got purged.
[2018.03.24-22.44.04:142] 0]LogBlueprint:Error: [compiler] Error Failed to find class for pin Element Bar
[2018.03.24-22.44.04:149] 0]LogBlueprint:Warning: [compiler] Warning [0957.82] Compile of Buff_TekArmor_Shirt_Rework failed. 2 Fatal Issue(s) 1 Warning(s) [in 205 ms]

Failing BP - Buff_TekArmor_Shirt_Rework
And its in the “Update Boost icon visiblity” function.

I suffer something similar with the bee hive bp and i fix it open it, recompiling and save it again, idk if works for you but hope helps.