If you are using IIS 7.0 Integrated mode you need to use the following code to add uploadmodule into web.config.
IIS 7.0 Integrated mode
<configuration>
<system.webServer>
<modules>
<add name="CuteWebUI.UploadModule" type="CuteWebUI.UploadModule,CuteWebUI.AjaxUploader"/>
</modules>
</system.webServer>
</configuration>
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