while opening an opportunity the fallowing error occurs please help me to know what is the issue and how to resolve it.

while opening an opportunity the fallowing error occurs please help me to know what is the issue and how to resolve it.



the error log is as below:


TypeError: Cannot read property 'setRequiredLevel' of null
at ShowHideRevenueComponent ( xxxxxxxxx.crm5.dynamics.com/.../int_opportunity.js )
at eval (eval at RunHandlerInternal ( xxxxxxxxx.crm5.dynamics.com/.../ClientApiWrapper.aspx ), <anonymous>:1:1)
at RunHandlerInternal ( xxxxxxxxx.crm5.dynamics.com/.../ClientApiWrapper.aspx )
at RunHandlers ( xxxxxxxxx.crm5.dynamics.com/.../ClientApiWrapper.aspx )
at ExecuteHandler ( xxxxxxxxx.crm5.dynamics.com/.../ClientApiWrapper.aspx )
at Mscrm.TurboForm.Control.CustomScriptsManager.$Dk_1 ( xxxxxxxxx.crm5.dynamics.com/.../formcontrols.js )
at Mscrm.TurboForm.Control.CustomScriptsManager.executeHandler ( xxxxxxxxx.crm5.dynamics.com/.../formcontrols.js )
at Mscrm.TurboForm.Control.CustomScriptsManager.executeHandlerByDescriptor ( xxxxxxxxx.crm5.dynamics.com/.../formcontrols.js )
at Mscrm.TurboForm.Control.ViewModel.FormViewModel.fireOnLoad ( xxxxxxxxxt.crm5.dynamics.com/.../formcontrols.js )
at Mscrm.TurboForm.Control.Data.DataEntity.$NM_1 ( xxxxxxxxx.crm5.dynamics.com/.../formcontrols.js )