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If you are using combined script generated from csg.syncfusion.com, you need to disable the embedded resources from assembly and refer the scripts manually. To disable embedded resource, please set value to ‘false’ for ‘LoadEJResourcesFromAssembly’ in the web.config file.
<add key="LoadEJResourcesFromAssembly" value="false" />
Refer to the following link for more details about embedded resource:
Once embedded resource is disabled, the themes and script will not be referred from the assembly. So you need to add the dependencies and script files manually in your page.