PCR workflow - HTTP handler for starting an external service cannot be read

Hi,
We are implementing PCR Approval using adobe forms. Currently when we try to open the adobe form for Approval from the UWL we get the error(it actually displays with an information message symbol) "HTTP handler for starting an external service cannot be read" in an ITS screen. We found an exactly similar problem in the below link but unable to find a resolution from that.
HTTP handler for starting an external service cannot be read
The detailed information message displayed is as given below,

HTTP handler for starting an external service cannot be read
Message no. SWK045
Diagnosis
This work item is a link to a HTTP service. To start the service, a launch handler must be known to the SAP System.
However, the system could not find a launch handler.
System response
The workflow system cannot start execution of the work item.
Procedure
Contact your workflow administrator:
In Customizing you must maintain a launch handler for HTTP-supported dialog services.
We use the standard task TS50000075 for PCR Approval
Can anyone help us on this?
Thanks,
Prasath N

Hi Jocelyn,
Thanks for that reply.
I tried the transactions SICF and WF_HANDCUST.
1. In SICF under sap>bc>webflow-->wshandler when i double click on wshandler it shows that the service is active. But when i right click on the same and try to TEST it, i get an error
Error in Web service execution
The launch handler was called with an incomplete parameter list 
I am not sure what this error means.
The configurations available in this service are as follows,
ICF path --> /default_host/sap/bc/webflow/
ICF Object --> wshandler
Decription --> English
Logon Procedure --> Standard
Security Requirements --> Standard
Basic Authentication --> Standard R/3 user
Anonymous logon data
client --> <empty>
user --> empty
password --> <empty-stillinitial>
Language --> <empty>
I am not clear what id and password should be maintained here. Can you please help us on this.
2. When i try to generate the URL in WF_HANDCUST and test them i get a success message.
Handler test
Test successful

Thanks,
Prasath N

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HTTP handler for starting an external service cannot be read

Hi,
When i execute the work item from Business Work place and also from the UWL in Enterprise portal of the task TS21300098 for HR Process Requisition workflow.
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