Relic Castle

Everytime I try to open the pokeball I get this error:
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Untitled
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Exception: RuntimeError
Message: Script error within event 3, map 25 (Route 4):
Exception: NoMethodError
Message: (eval):1:in `pbExecuteScript'undefined method `pbRecieveItem' for Kernel:Module
***Full script:
Kernel.pbRecieveItem(
PBItems::GREATBALL,5)

Interpreter:243:in `pbExecuteScript'
Interpreter:1606:in `eval'
Interpreter:243:in `pbExecuteScript'
Interpreter:1606:in `command_355'
Interpreter:494:in `execute_command'
Interpreter:193:in `update'
Interpreter:106:in `loop'
Interpreter:198:in `update'
Scene_Map:104:in `update'
Scene_Map:102:in `loop'

Interpreter:276:in `pbExecuteScript'
Interpreter:1606:in `command_355'
Interpreter:494:in `execute_command'
Interpreter:193:in `update'
Interpreter:106:in `loop'
Interpreter:198:in `update'
Scene_Map:104:in `update'
Scene_Map:102:in `loop'
Scene_Map:115:in `update'
BW_MapClock:61:in `main'

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OK
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And also the script I use is:
Kernel.pbRecieveItem(
PBItems::GREATBALL,5)