Error querying between dates with parameters

I know, the title is hard to explain but I will try....

In SSRS 2005 I have a lenghty query that has paramters for a @startdate and an @enddate. I use this in the query in the where statement like

eventtime between @startdate and @enddate

If I run the query and get promted for the the @startdate and @enddate but it then fails with an error:

            An error occurered while executing the query.
            Conversion failed when converting the nvarchar value '04/01/2012' to data type int.

The query works fine if I declare the @startdate and @enddate and then
set the @startdate and @enddate with the same values in the query. But if I declare the then I don't get prompted.

Any ideas?
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Kyle AbrahamsSenior .Net DeveloperCommented:
Change the parameter type to date time in your report.
edrz01Author Commented:
Already is. The problem is when I test the query it fails, when I run from the preview it works. I need it to work within the query test first so i verify what information it is pulling.
Kyle AbrahamsSenior .Net DeveloperCommented:
Are there other parameters?  Verify you're passing the parameters correctly and in the proper order.
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edrz01Author Commented:
Thanks ged325, I have thoroughly done that before I posted.
Kyle AbrahamsSenior .Net DeveloperCommented:
There's a parameter mismatch of some kind going on.  Can you post your parameters and the procedure?  Also did you confirm you're pointing at the right database?

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