Need an expert Java full stack developer to help this code issue

Hi All, im using this from github, [login to view URL] It is a scheduler for aircondition control What I see is a very long error in openhab when the schedule runs. I need someone to assist me in getting this running error free. Thank you! 21:45:00.043 [INFO ] [[login to view URL] ] - Item 'HVAC_Bed3_Target_Temp' received command 30 21:45:00.043 [INFO ] [[login to view URL]] - HVAC_Queue changed from HVAC_Bed3_Target_Temp=30 to 21:45:00.044 [ERROR] [[login to view URL] ] - Job (DEFAULT.2019-09-09T21:45:00.000+10:00: Proxy for [login to view URL]$Procedure0: [ | { <XFeatureCallImplCustom>.postUpdate(<XFeatureCallImplCustom>) <XFeatureCallImplCustom>.cancel() <null>.tempCtlTimer = <XNullLiteralImplCustom> } ] threw an exception. [login to view URL]: Job threw an unhandled exception. at [login to view URL]([login to view URL]) [107:[login to view URL]:[login to view URL]] at [login to view URL]$[login to view URL]([login to view URL]) [107:[login to view URL]:[login to view URL]] Caused by: [login to view URL]: cannot invoke method public abstract boolean [login to view URL]() on null at [login to view URL]([login to view URL]) ~[?:?] at [login to view URL]([login to view URL]) ~[?:?] at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter._invokeFeature([login to view URL]) ~[?:?] at [login to view URL]([login to view URL]) ~[?:?] at [login to view URL]([login to view URL]) ~[?:?] at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter._doEvaluate([login to view URL]) ~[?:?] at [login to view URL]([login to view URL]) ~[?:?] at [login to view URL]([login to view URL]) ~[?:?] at [login to view URL]([login to view URL]) ~[?:?] at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter._doEvaluate([login to view URL]) ~[?:?] at [login to view URL]([login to view URL]) ~[?:?] at [login to view URL]([login to view URL]) ~[?:?] at [login to view URL]([login to view URL]) ~[?:?] at [login to view URL]([login to view URL]) ~[?:?] at [login to view URL]([login to view URL]) ~[?:?] at [login to view URL]([login to view URL]) ~[?:?] at com.sun.proxy.$[login to view URL](Unknown Source) ~[?:?] at [login to view URL]([login to view URL]) ~[?:?] at [login to view URL]([login to view URL]) ~[?:?] ... 1 more