Error Evaluating UI Expression
Expression evaluation error at function rule!VFM_VehicleReportinterface: Rule 'vfm_vehiclereportinterface' has 1 parameters, but instead passed 0 parameters.

Question

Hello, 
 I have created a pie chart and a Grid i two separate interfaces. Now I have taken a new interface and I have designed two sections one for Pie chart and another for Grid. But while creating a report and opening it throws an error - "Error Evaluating UI Expression Expression evaluation error at function rule!VFM_VehicleReportinterface: Rule 'vfm_vehiclereportinterface' has 1 parameters, but instead passed 0 parameters." 
 I have also checked in 'vfm_vehiclereportinterface' but couldn't make out the parameters, Thus I request a help.

deviratnamv · Accepted Answer

Hi Nellorea, 
I have understood your error, may be you have rule inputs in vfm_vehicleReportinterface() interface but didn't pass parameters when calling the vfm_vehicleReportinterface() interface that's the reason you getting an error on "Error Evaluating UI Expression 
Expression evaluation error at function rule!VFM_VehicleReportinterface: Rule 'vfm_vehiclereportinterface' has 1 parameter, but instead passed 0 parameters.". If you don't want ruleinpts parameter then delete the rule inputs directly. 
if you want to pass the parameters then call the interface as rule!VFM_VehicleReportinterface(ri!ruleinputs). without parameters rule!VFM_VehicleReportinterface().

Ashvin Kapur · Answer

Please check the Rule Inputs in VFM_vehicleReportInterface - likely there is one rule input in that rule, and when you call it, you've passed in 0 parameters. If you want the rule input to be null on load, you can define the parameter and just have "rule!VFM_VehicleReportInterface(ruleInput: null)" which should solve your issue.