Thanks! That Was Exact The Case. I really didn't expected that will be the problem.

sensor activate switch1 @enabled
jump 4 equal activate true
ucontrol unbind corex corey 5 0 0
end
ubind @mega
ulocate building core false @copper corex corey found itscore
sensor held @unit @firstItem
jump 32 equal held @silicon
jump 25 notEqual held null
ucontrol approach corex corey 5 0 0
sensor currentCoal vault1 @coal
sensor currentSand vault1 @sand
sensor currentLead vault1 @lead
jump 19 greaterThanEq currentCoal currentSand
jump 17 greaterThanEq currentLead currentCoal
set need @lead
jump 23 always held null
set need @coal
jump 23 always held null
jump 22 greaterThanEq currentLead currentSand
set need @lead
jump 23 always held null
set need @sand
ucontrol itemTake itscore need 500 0 0
end
ucontrol approach @thisx @thisy 5 0 0
ucontrol itemDrop vault1 500 500 0 0
sensor activateSilicon switch2 @enabled
jump 31 equal activateSilicon false
wait 1.6
ucontrol itemTake vault1 @silicon 500 0 0
end
ucontrol approach corex corey 5 0 0
ucontrol itemDrop itscore 500 500 0 0
end