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CRM 2011 exception : The formatter threw an exception while trying to deserialize the message

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Hi all

since a few day, I'm having headache with crm 2011 wcf services, when I'm trying to access crm from code for all retrive request I have a strange exception like this one :

"The formatter threw an exception while trying to deserialize the message:
There was an error while trying to deserialize parameter http://schemas.microsoft.com/xrm/2011/Contracts/Services:request. The InnerException message was
'Error in line 1 position 450.
Element 'http://schemas.microsoft.com/xrm/2011/Contracts/Services:request'
contains data from a type that maps to the name
'http://schemas.microsoft.com/xrm/2011/Contracts:RetrieveAttributeRequest'.
The deserializer has no knowledge of any type that maps to this name.
Consider changing the implementation of the ResolveName method on your DataContractResolver to return a non-null value
for name 'RetrieveAttributeRequest' and namespace 'http://schemas.microsoft.com/xrm/2011/Contracts'.'.

all crm 2011 outlook client connection throw the same exception, trying to connect to crm 2011 via email router also throw the same exception but for different request message. it seem like crm 2011 web services crash. I try to repair CRM but also conitue to have the same exception... any help will be good

thanks


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