According to the last exception, some lines are likely missing from /Web.config
Check if you have the following lines there:
Check if you have the following lines there:
<configuration>
<system.web>
<compilation debug="true" optimizeCompilations="false">
<assemblies>
<add assembly="System.Workflow.ComponentModel, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
<add assembly="System.Workflow.Activities, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />