while converting amount in to words iam getting error in crystal report

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ASP.NET

A number, currency amount, boolean, date, time, date-time, or string is expected here.
Details: errorKind Error in File RptEstimationcghs_report {78B2316C-6E7B-4FF6-8105-C86BB27EB401}.rpt:
Error in formula amoutwords: 'Towords({@amtwords},0) +"and"+ ToWards({Round({@amtwords},2} - Int({@amtwords})) * 100,0)+" paise only "'
A number, currency amount, boolean, date, time, date-time, or string is expected here.
Details: errorKind

formula

Towords({@amtwords},0) +"and"+ ToWards({Round({@amtwords},2} - Int({@amtwords})) * 100,0)+" paise only "