Hi Rubén,
Thank you for contacting Syncfusion support.
We have analyzed the provided sample and found that CDN links were referred with wrong version, so the reported error occurred. Kindly refer the CDN links with version to avoid the conflicts. Also please use both NuGet packages, Scripts and CSS of same version in your project.
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<link rel='nofollow' href="https://cdn.syncfusion.com/ej2/18.3.47/material.css" rel="stylesheet" />
<script src="https://cdn.syncfusion.com/ej2/18.3.47/dist/ej2.min.js" type="text/javascript"></script>
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We have modified the sample and shared the same in the below link,
Please try it and revert us with more details, if you still need assistance.
Regards,
Akshaya