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47There was an issue we came across today where the users were not able to run any report on AX client and were getting the below error;
“The formatter threw an exception while trying to deserialize the message: There was an error while trying to deserialize parameterhttp://tempuri.org/:queryBuilderArgs. The InnerException message was ‘Element ‘http://tempuri.org/:queryBuilderArgs’ contains data from a type that maps to the name ‘http://schemas.datacontract.org/2004/07/XppClasses:SRSQueryBuilderArgs’. The deserializer has no knowledge of any type that maps to this name. Consider using a DataContractResolver or add the type corresponding to ‘SRSQueryBuilderArgs’ to the list of known types – for example, by using the KnownTypeAttribute attribute or by adding it to the list of known types passed to DataContractSerializer.’. Please see InnerException for more details”.
Reason:
This happens quite frequently when AOS serving the reporting server crashes, or someone restart the AOS server without ending client user sessions.
Solution:
To overcome this problem and to make things straight, kindly follow the below steps;
- Manually end client’s session, AX> System Admin > Users> Online user> End session.
- Stop AOS.
- Open SQL, Select the record from SysClientSessions, take the backup of the records just to be on a safe side.
- Delete all the records from SysClientSessions table from the databse.
- Restart SSRS services
- Start AOS
Note : In some cases following only Step 2, 5 and 6 resolves this issue.
This should resolve your problem.. 
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