SSRS Web Application Error. Having version issues - reporting-services

Question

Here is what I have and I'm sure it is versioning but I can't seem to figure it out.
Visual Studio 2019
Framework : 4.7.2
This was Framework 3.5 and I upgraded to version 4.7.2. It was working until I open a report to edit and then it wants to edit the Report (RDLC).
Error1: Severity Code Description Project File Line Suppression State
Error The type 'Microsoft.Reporting.WebForms.ReportViewer' exists in both 'c:\Windows\assembly\GAC_MSIL\Microsoft.ReportViewer.WebForms\9.0.0.0__b03f5f7f11d50a3a\Microsoft.ReportViewer.WebForms.dll' and 'c:\Windows\assembly\GAC_MSIL\Microsoft.ReportViewer.WebForms\10.0.0.0__b03f5f7f11d50a3a\Microsoft.ReportViewer.WebForms.dll' D:\Development\Work\asedra\Website\Reports\RptViolation.aspx 44
Error 2 : ASP.NET session has expired
Web.config:
<buildProviders>
<add extension=".rdlc" type="Microsoft.Reporting.RdlBuildProvider, Microsoft.ReportViewer.WebForms, Version=15.0.0.0, Culture=neutral, PublicKeyToken=89845DCD8080CC91"/>
</buildProviders>
<assemblies>
<add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
<add assembly="Microsoft.ReportViewer.DataVisualization, Version=10.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
<add assembly="Microsoft.ReportViewer.ProcessingObjectModel, Version=10.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
<add assembly="Microsoft.SqlServer.Types, Version=14.0.0.0, Culture=neutral, PublicKeyToken=89845DCD8080CC91"/>
</assemblies>
rdlc
<Report xmlns="http://schemas.microsoft.com/sqlserver/reporting/2016/01/reportdefinition" xmlns:rd="http://schemas.microsoft.com/SQLServer/reporting/reportdesigner">
the web page (.aspx)
<%# Register Assembly="Microsoft.ReportViewer.WebForms, Version=10.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A" Namespace="Microsoft.Reporting.WebForms" TagPrefix="rsweb" %>[![enter image description here][1]][1]

Answer 1

Error1: Register ReportViewer on .aspx like this
<%# Register assembly="Microsoft.ReportViewer.WebForms" namespace="Microsoft.Reporting.WebForms" tagprefix="rsweb" %>
Add to web.config this line
<system.webServer>
<handlers>
<add name="ReportHandler" verb="*" path="Reserved.ReportViewerWebControl.axd" type="Microsoft.Reporting.WebForms.HttpHandler, Microsoft.ReportViewer.WebForms, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
</handlers>
</system.webServer>
Error2: Store session state on SQL server. Here's a guide: HOW TO: Configure SQL Server to Store ASP.NET Session State.
Basically, you need to create ASPState database, activate ASP.NET State Service and add this line to the web.config:
<sessionState
mode="SQLServer"
sqlConnectionString="data source=127.0.0.1;user id=<username>;password=<strongpassword>"
cookieless="false"
timeout="20"
/>