help with BollingerBand study creation

[indus383]

Hi, i am trying to create an EFS which plots the bollingerband study of 240minute time frame on 5 minute time frame. I have done this successfully for HullMA but facing difficulty with the inbuilt bollinger band functions.

BB = BollingerStudy(20,close(0,inv(240)),2)
says "Error: Function 'BollingerStudy': Invalid EFS Object construction. Please review your code."

[indus383]

Found the solution, it was straight forward. Has to use the customBB from the Built-in-Forumlas