Web I Audit report # ERROR

Hi Gurus,

i am trying to customise an existing audit report in 3.1 environment.

j have created 2 variables

Start date: =FormatDate(ToDate(UserResponse("Start Date:");"");"MM/dd/yyyy")

End date: =FormatDate(ToDate(UserResponse("End Date:");"");"MM/dd/yyyy")

output: "Date range: " + [Start date:] + " to "+ [End date:]

i am getting errror: #ERROR

Thank you for the help !!!