can anyone tell me why this is getting a runtime error?
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<title>Best Practices in Laboratory Medicine | Home</title>
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<h1>Register</h1>
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<label>Name</label>
<asp:TextBox runat="server" id="reg_name" name="reg_name"></asp:textbox>
<label>Position</label>
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<label>Institution</label>
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<label>City</label>
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<label>State</label>
<asp:DropDownList runat="server" id="reg_state" name="reg_state">
<asp:ListItem value="AK" id="ak" runat="server">AK</asp:ListItem >
<asp:ListItem value="AL" id="AL" runat="server">AL</asp:ListItem >
<asp:ListItem value="AR" id="ar" runat="server">AR</asp:ListItem >
<asp:ListItem value="AZ" id="az" runat="server">AZ</asp:ListItem >
<asp:ListItem value="CA" id="ca" runat="server">CA</asp:ListItem >
<asp:ListItem value="CO" id="co" runat="server">CO</asp:ListItem >
<asp:ListItem value="CT" id="ct" runat="server">CT</asp:ListItem >
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<asp:ListItem value="DE" id="de" runat="server">DE</asp:ListItem >
<asp:ListItem value="FL" id="fl" runat="server">FL</asp:ListItem >
<asp:ListItem value="GA" id="ga" runat="server">GA</asp:ListItem >
<asp:ListItem value="HI" id="hi" runat="server">HI</asp:ListItem >
<asp:ListItem value="IA" id="ia" runat="server">IA</asp:ListItem >
<asp:ListItem value="ID" id="id" runat="server">ID</asp:ListItem >
<asp:ListItem value="IL" id="il" runat="server">IL</asp:ListItem >
<asp:ListItem value="IN" id="in" runat="server">IN</asp:ListItem >
<asp:ListItem value="KS" id="ks" runat="server">KS</asp:ListItem >
<asp:ListItem value="KY" id="ky" runat="server">KY</asp:ListItem >
<asp:ListItem value="LA" id="la" runat="server">LA</asp:ListItem >
<asp:ListItem value="MA" id="ma" runat="server">MA</asp:ListItem >
<asp:ListItem value="MD" id="md" runat="server">MD</asp:ListItem >
<asp:ListItem value="ME" id="me" runat="server">ME</asp:ListItem >
<asp:ListItem value="MI" id="mi" runat="server">MI</asp:ListItem >
<asp:ListItem value="MN" id="mn" runat="server">MN</asp:ListItem >
<asp:ListItem value="MO" id="mo" runat="server">MO</asp:ListItem >
<asp:ListItem value="MS" id="ms" runat="server">MS</asp:ListItem >
<asp:ListItem value="MT" id="mt" runat="server">MT</asp:ListItem >
<asp:ListItem value="NC" id="nc" runat="server">NC</asp:ListItem >
<asp:ListItem value="ND" id="nd" runat="server">ND</asp:ListItem >
<asp:ListItem value="NE" id="ne" runat="server">NE</asp:ListItem >
<asp:ListItem value="NH" id="nh" runat="server">NH</asp:ListItem >
<asp:ListItem value="NJ" id="nj" runat="server">NJ</asp:ListItem >
<asp:ListItem value="NM" id="nm" runat="server">NM</asp:ListItem >
<asp:ListItem value="NV" id="nv" runat="server">NV</asp:ListItem >
<asp:ListItem value="NY" id="ny" runat="server">NY</asp:ListItem >
<asp:ListItem value="OH" id="oh" runat="server">OH</asp:ListItem >
<asp:ListItem value="OK" id="ok" runat="server">OK</asp:ListItem >
<asp:ListItem value="OR" id="or" runat="server">OR</asp:ListItem >
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<asp:ListItem value="SC" id="sc" runat="server">SC</asp:ListItem >
<asp:ListItem value="SD" id="sd" runat="server">SD</asp:ListItem >
<asp:ListItem value="TN" id="tn" runat="server">TN</asp:ListItem >
<asp:ListItem value="TX" id="tx" runat="server">TX</asp:ListItem >
<asp:ListItem value="UT" id="ut" runat="server">UT</asp:ListItem >
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<asp:ListItem value="VT" id="vt" runat="server">VT</asp:ListItem >
<asp:ListItem value="WA" id="wa" runat="server">WA</asp:ListItem >
<asp:ListItem value="WI" id="wi" runat="server">WI</asp:ListItem >
<asp:ListItem value="WV" id="wv" runat="server">WV</asp:ListItem >
<asp:ListItem value="WY" id="wy" runat="server">WY</asp:ListItem >
</asp:DropDownList>
<label>Zip/Postal Code</label>
<asp:TextBox runat="server" id="reg_zip" name="reg_zip"></asp:textbox>
<p>I am interested in:</p>
<table>
<tr>
<td><asp:CheckBox runat="server" id="reg_topics" name="reg_topics"></asp:CheckBox></td>
<td><label style="padding:0 0 10px 20px;">being notified of future topics for which we might contribute data</label></td>
</tr>
<tr>
<td><asp:CheckBox runat="server" id="reg_findings" name="reg_findings"></asp:CheckBox></td>
<td><label style="padding:0 0 10px 20px;">being notified when findings or recommendations are issued</label></td>
</tr>
<tr>
<td><asp:CheckBox runat="server" id="reg_updates" name="reg_updates"></asp:CheckBox></td>
<td><label style="padding:0 0 10px 20px;">receiving periodic updates on the status of Laboratory Medicine Best Practices</label></td>
</tr>
</table>
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</form></div>
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