The error is stating there is duplicate 'uri' section defined.
There is a duplicate 'uri' section defined
Default App pool with Workflow virtual directories was configured with .net Framework Version v4.0.
Right-click App pool > Advanced Settings.
In .NET Framework Version dropdown list choose v2.0 version and click OK.
Relaunch ProcessManager portal
ServiceDesk/Workflow 7.1 SP2
Workflow 7.1 SP2 MP1
ServiceDesk 7.5 GA, MP1, SP1