asp.net - Error adding DnnDatePicker -


i trying add dnndatepicker custom dotnetnuke module "error creating control" error (unknown server tag dnn:dnndatepicker) , control underlined "element dnndatepicker not known element. can occur if there compilation error in website or web.config file missing".

my import statements:

<%@ register assembly="dotnetnuke.web" namespace="dotnetnuke.web.ui.webcontrols" tagprefix="dnn" %> <%@ register tagprefix="dnn" tagname="label" src="~/controls/labelcontrol.ascx" %> 

<div style="font-weight:bold" aria-haspopup="true" class="datepickertext"></div>  <dnn:dnndatepicker runat="server" id="startdatepicker" /></div>

i'm using asp.net 4.5 , dnn 7.2.2

any ideas?

*** add reference >> dotnetnuke (\bin\dotnetnuke.dll)

at page top:

<%@ register tagprefix="dnn" assembly="dotnetnuke.web" namespace="dotnetnuke.web.ui.webcontrols" %>

then show datepicker:

<dnn:dnndatepicker id="dnndatepicker1" runat="server" cssclass="cssclass1" />

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