Here's the error code
Workflow paused due to error: Unhandled Exception: System.ServiceModel.FaultException`1[[Microsoft.Xrm.Sdk.OrganizationServiceFault, Microsoft.Xrm.Sdk, Version=5.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35]]: Need to start a transaction before commitDetail:
<OrganizationServiceFault xmlns:i="www.w3.org/.../XMLSchema-instance" xmlns="schemas.microsoft.com/.../Contracts">
<ErrorCode>-2147220911</ErrorCode>
<ErrorDetails xmlns:d2p1="schemas.datacontract.org/.../System.Collections.Generic" />
<Message>Need to start a transaction before commit</Message>
<Timestamp>2012-04-28T02:17:13.8495706Z</Timestamp>
<InnerFault>
<ErrorCode>-2147220911</ErrorCode>
<ErrorDetails xmlns:d3p1="schemas.datacontract.org/.../System.Collections.Generic" />
<Message>Need to start a transaction before commit</Message>
<Timestamp>2012-04-28T02:17:13.8495706Z</Timestamp>
<InnerFault i:nil="true" />
<TraceText i:nil="true" />
</InnerFault>
<TraceText i:nil="true" />
</OrganizationServiceFault>
at Microsoft.Crm.Extensibility.OrganizationSdkServiceInternal.Create(Entity entity, CorrelationToken correlationToken, CallerOriginToken callerOriginToken, WebServiceType serviceType)
at Microsoft.Crm.Extensibility.InprocessServiceProxy.CreateCore(Entity entity)
at Microsoft.Crm.Workflow.Services.CreateActivityService.<>c__DisplayClass1.<CreateInternal>b__0(IOrganizationService sdkService)
at Microsoft.Crm.Workflow.Services.ActivityServiceBase.ExecuteInTransactedContext(ActivityDelegate activityDelegate)
at Microsoft.Crm.Workflow.Services.CreateActivityService.ExecuteInternal(ActivityContext executionContext, CreateEntity createEntity)
at Microsoft.Crm.Workflow.Services.CreateActivityService.Execute(ActivityContext executionContext, CreateEntity createEntity)
at System.Activities.CodeActivity.InternalExecute(ActivityInstance instance, ActivityExecutor executor, BookmarkManager bookmarkManager)
at System.Activities.Runtime.ActivityExecutor.ExecuteActivityWorkItem.ExecuteBody(ActivityExecutor executor, BookmarkManager bookmarkManager, Location resultLocation)