Loading Metadata Through NPrinting From QlikSense Generates Error

1.Reload the metadata from NPrinting for Qlik Sense app, it generates the error. Duplicate the app, the reload is successful. 

ERROR : Object reference not set to an instance of an object. STACK :    at Engine.Navigator.QlikSense.SDK.Extensions.SdkExtensionMethods.CreateMeasureEntity(String sheetObjectId, SenseApp app, INxMeasure measure)??

Upgraded NPrinting to February 2018 and see the below log.

Engine.Navigator.QlikSense.SDK    1.0.0.0    Engine.Navigator.QlikSense.SDK.Resolvers.Contents.QlikSenseMetadataRequestResolver    20180410T060211.844+08:00    ERROR    HCDBI03        0    0    0    0    0    0    0    0    An error occurred while processing object c3e1f76b-d5bb-4abe-b822-d988f48011ab contained in sheet 84cd7bd6-1edf-48df-9deb-411353f270c4 of Sense app d220181d-cd2c-49a3-b308-6617a25a4d68 during metadata reload of connection navigator=qliksense;proxyurl=https://xxxx.xxx.xxx.xxxl/;appid=d220181d-cd2c-49a3-b308-6617a25a4d68;identity=xxx\xxx. ERROR: Object reference not set to an instance of an object.

2.In QMC, this sheet id does not exits. 

SELECT * FROM public."AppObjects"

WHERE "App_ID" = 'd220181d-cd2c-49a3-b308-6617a25a4d68' 

AND "ObjectType" = 'sheet' 

and "EngineObjectId" = '84cd7bd6-1edf-48df-9deb-411353f270c4'  

Find the ID, then confirm with the sheet owner.  Then delete this sheet from QMC.