A few of our clients have reported that after customizing a Project Workspace or deploying a customized Project Workspace, they begin to see Reporting (WSS Sync) errors in their queue:

When they view the details of this error, they see the following details (duplicate lines removed for your convenience):

Error summary/areas:
Reporting Wss list sync failed
ReportingWssSyncListFailed
Reporting message processor failed
ReportingWSSSyncMessageFailed
Queue
GeneralQueueJobFailed

Error details:

<errinfo>
<general>
<class name="Reporting Wss list sync failed">
<error id="24018" name="ReportingWssSyncListFailed" uid="7e7fa8da-24d4-4c4d-a9ab-c32ed46e205c" SPListType="1100" Error="Failed to prepare the transfer of SP list 1100 for project ‘89ec6841-1f56-46b1-b97b-d775f0ca7e06′. The field Category was missing from the SP list and was ignored." />
</class>
<class name="Reporting message processor failed">
<error id="24016" name="ReportingWSSSyncMessageFailed" uid="79d63cef-5a83-46b1-bc6c-c0124311b60f" QueueMessageBody="ProjectUID=’89ec6841-1f56-46b1-b97b-d775f0ca7e06′. ForceFullSync=’False’" Error="RDS failed while trying to sync one or more SP lists. The RDS queue message will be retried." />
</class>
<class name="Queue">
<error id="26000" name="GeneralQueueJobFailed" uid="b04b7077-731c-4149-87ac-89af07377229" JobUID="ba088e4e-781a-4bc4-b787-3e24ac2849ec" ComputerName="EPM2007DEMO" GroupType="ReportingWSSSync" MessageType="WSSSyncMessageEx" MessageId="1" Stage="" />
</class>
</general>
</errinfo>