we have a SharePoint 2016 farm on premises with 2 WFE servers, we are now adding one more WFE server, hence we installed SP 2016 including latest cumulative updates in the new server, everything went fine till then, all the site collections which doesn't have any customizations are working fine. but, when we try to access a site collection which has customizations like left navigation and top ribbon with custom drop down values are giving the following error.
Could not load file or assembly 'Telerik.Web.UI, Version=2010.3.1109.35, Culture=neutral, PublicKeyToken=121fae78165ba3d4' or one of its dependencies. The system cannot find the file specified.
we are unable to fix this issue, hope you can guide us with the correct remediation steps to fix it.