I’ve had this issue a few times using the R3 CU11 VM which seems to be a known issue back in RTM, R2 but I’ve been lucky enough to not see it until CU11 so not sure if it’s a regression. But if you run into it you can find these notes on LCS

https://fix.lcs.dynamics.com/Issue/Solution/1191421?bugId=3629881&qc=a2441abb6001ea34d6368ab787f2deeeac5b33892029ae440154943d231fa0f2

https://fix.lcs.dynamics.com/Issue/Solution/1191421?bugId=3618686&qc=a2441abb6001ea34d6368ab787f2deeeac5b33892029ae440154943d231fa0f2

The formatter threw an exception while trying to deserialize the message: There was an error while trying to deserialize parameter http://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.

I found another post in the community that suggestion cleaning up the AOC files. I was able to get pass it by re-starting the AOS.

Cheers

Lachlan