SharePoint 2013 SQL Reporting Services 2014 500 error

We have a 3 server farm: 2 WFE, 1 App. SharePoint Enterprise license

The App server has the SQL 2014 reporting services integrated SharePoint with the add in installed. The WFEs all have the Add in installed. I’ve run the:

Install-SPRSService
Install-SPRSServiceProxy

commands on both WFEs and APP server. (The service is not running on the WFEs, Should it be?)

I installed the Service Application. When I go to manage the service application, I get the error:

Something went wrong, the server returned (500) internal server error

The following is the ULS Log of the event:

WcfSendRequest: RemoteAddress:
‘http://ApplicationServer:32843/91362f8835d04903ac3a703a64a8ae54/ReportingWebService.svc‘
Channel:
‘Microsoft.ReportingServices.ServiceContract.IReportServiceManagement’
Action:
‘http://schemas.microsoft.com/sqlserver/reporting/2011/06/01/ReportServer/Management/GetSystemProperties‘
MessageId: ‘urn:uuid:a1e5f804-4819-4dc5-ad17-1595d14a2212’ Application
error when access
/_admin/ReportServer/ReportingServicesSystemSettings.aspx, Error=The
remote server returned an error: (500) Internal Server Error. at
System.Net.HttpWebRequest.GetResponse() at
System.ServiceModel.Channels.HttpChannelFactory1.HttpRequestChannel.HttpChannelRequest.WaitForReply(TimeSpan
timeout) System.Net.WebException: The remote server returned an error:
(500) Internal Server Error. at
System.Net.HttpWebRequest.GetResponse() at
System.ServiceModel.Channels.HttpChannelFactory1.HttpRequestChannel.HttpChannelRequest.WaitForReply(TimeSpan
timeout) Getting Error Message for Exception
System.Web.HttpUnhandledException (0x80004005): Exception of type
‘System.Web.HttpUnhandledException’ was thrown. —>
System.ServiceModel.ProtocolException: The content type text/html;
charset=utf-8 of the response message does not match the content type
of the binding (application/soap+msbin1). If using a custom encoder,
be sure that the IsContentTypeSupported method is implemented
properly. The first 1024 bytes of the response were: ‘ IIS 8.5 Detailed
Error – 500.19 – Internal Server Error System.Net.WebException: The remote
server returned an error: (500) Internal Server Error. at
System.Net.HttpWebRequest.GetResponse() at
System.ServiceModel.Channels.HttpChannelFactory1.HttpRequestChannel.HttpChannelRequest.WaitForReply(TimeSpan
timeout) --- End of inner exception stack trace --- Server
stack trace: at
System.ServiceModel.Channels.HttpChannelUtilities.ValidateRequestReplyResponse(HttpWebRequest
request, HttpWebResponse response, HttpChannelFactory1 factory,
WebException responseException, ChannelBinding channelBinding) at
System.ServiceModel.Channels.HttpChannelFactory1.HttpRequestChannel.HttpChannelRequest.WaitForReply(TimeSpan
timeout) at
System.ServiceModel.Channels.RequestChannel.Request(Message message,
TimeSpan timeout) at
System.ServiceModel.Channels.SecurityChannelFactory1.SecurityRequestChannel.Request(Message
message TimeSpan timeout) at
System.ServiceModel.Channels.ServiceChannel.Call(String action,
Boolean oneway, ProxyOperationRuntime operation, Object[] ins,
Object[] outs, TimeSpan timeout) at
System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage
methodCall, ProxyOperationRuntime operation) at
System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage
message) Exception rethrown at [0]: at
System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage
reqMsg, IMessage retMsg) at
System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData&
msgData, Int32 type) at
Microsoft.ReportingServices.ServiceContract.IReportServiceManagement.GetSystemProperties(ICollection1
properties) at
Microsoft.ReportingServices.SharePointSharedService.ProxyHelper.<>c__DisplayClass9.<GetSystemProperties>b__8(IReportServiceManagement
mchannel) at
Microsoft.ReportingServices.SharePoint.SharedService.ProxyHelper.DoManagementChannelCall(Action1
caller) at
Microsoft.ReportingServices.SharePoint.SharedService.UI.ReportingServicesSystemSettings.get_SystemProperties()
at
Microsoft.ReportingServices.SharePoint.SharedService.UI.ReportingServicesSystemSettings.LoadSettings()
at
Microsoft.ReportingServices.SharePoint.SharedService.UI.ReportingServicesSystemSettings.OnInit(EventArgs
e) at System.Web.UI.Control.InitRecursive(Control namingContainer)
at System.Web.UI.Page.ProcessRequestMain(Boolean
includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
at System.Web.UI.Page.HandleError(Exception e) at
System.Web.UI.Page.ProcessRequestMain(Boolean
includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
at System.Web.UI.Page.ProcessRequest(Boolean
includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
at System.Web.UI.Page.ProcessRequest() at
System.Web.UI.Page.ProcessRequest(HttpContext context) at
System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step,
Boolean& completedSynchronously)