During the installation of Telerik Reporting on your machine, the Telerik Reporting assemblies were added to GAC. When deploying a Web Application project the assemblies from the GAC are not copied automatically so you need to make sure the assemblies physically exist in the bin folder of your application. The required assemblies for the HTML5 Report Viewer scenario are:
There are some optional assemblies which add up to the core reporting functionality and should be used only if you need the specific feature. They are responsible for additional support formats, database session, retrieving data from an OLAP cube, etc. The list of optional assemblies can be found here
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