I have started to get error while using esuRestApi CreateObject with Metadatalist

Hi,

We use .Net technology as development environment so we use atmos-dotnet wrapper(EsuApiLib), the day before yesterday it was fine, and working but now I have started to get error while creating objects with EsuApiLib(for .NET) CreateObject if I use metadatalist.

It is fine as below

Identifier id = this.esu.CreateObject(null, null, content, null);

but if i use metadalist,

MetadataList mlist = new MetadataList();

Metadata createDate = new Metadata("CreatedDate", "20.11.2015 15:09:21", true);

Metadata fileName = new Metadata("FileName", "web.config", true);

Metadata userIp = new Metadata("userIp", "192.168.209.1", false);

Metadata sessionId = new Metadata("sessionId", "524290", false);

mlist.AddMetadata(createDate);

mlist.AddMetadata(fileName);

mlist.AddMetadata(userIp);

mlist.AddMetadata(sessionId);

ObjectId id = this.esu.CreateObject(null, mlist, byteArray, null);

it started to get error after yesterday, before it was fine and working.I do not change anything on code and api side.But as our system admins said they changed atmos switch cards or something like that ! First thing that came to my mind that maybe firmware version or a configuration may cause this error ? Do I need a newer version EsuApi  ?

EsuApiLib AssemblyVersion : 2.1.4.32

Atmos system version :  2.2.1.0.87112

Error Line in EsuApiLib

     // Check response

     resp = (HttpWebResponse)con.GetResponse();