tfs2010 - Add parameter to report URL: Parameter is missing a value -

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i'm trying insert ssrs report in webpart in sharepoint. report tfs sprint burndown chart. this, need generate report using following url: 

http://vhacpadev04/reportserver/pages/reportviewer.aspx?/tfsreports/vapars+team/sprint+burndown&rs:command=render&rs:format=html4.0&rc:parameters=true&rp:sprintparam=release+2%5csprint+1

the project name in tfs vapars team. sprint i'm trying run chart release 2 sprint 1.

typically, reportviewer prompt me parameter. in case, sprintparam:

enter image description here

however, when hide (using &rc:parameters=false), following error:

missing parameter value message

and here's parameter properties report on ssrs:

parameter list

i'm not sure how format url pass correct sprint parameter. suggestions?

you need provide default value sprintparam (even though overriding in url) or need remove dependency on parameter if used cascading parameters. report thinks cannot run without information, though supplying in url. startdateparam , enddateparam query based i'm guessing have dependency on sprintparam. that's causing error display , url parameters ignored.


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