Creating package error help

We have a time when we keep getting this error Silanis.ESL.SDK.EslException: Could not create a new package. Exception: Unexpected character encountered while parsing value: <. path="" line="" position=""> Newtonsoft.Json.JsonReaderException: Unexpected character encountered while parsing value: <. path="" line="" position="" at="" newtonsoft.json.jsontextreader.parsevalue="" newtonsoft.json.jsontextreader.readinternal="" newtonsoft.json.jsontextreader.read="" newtonsoft.json.serialization.jsonserializerinternalreader.readfortype="" reader="" jsoncontract="" contract="" boolean="" hasconverter="" newtonsoft.json.serialization.jsonserializerinternalreader.deserialize="" type="" objecttype="" checkadditionalcontent="" newtonsoft.json.jsonserializer.deserializeinternal="" newtonsoft.json.jsonconvert.deserializeobject="" value="" jsonserializersettings="" settings="" silanis.esl.sdk.eslserverexception..ctor="" message="" string="" errordetails="" webexception="" cause="" silanis.esl.sdk.internal.httpmethods.posthttp="" apitoken="" byte="" content="" silanis.esl.sdk.restclient.post="" jsonpayload="" silanis.esl.sdk.services.packageservice.createpackage="" package="" end="" of="" inner="" exception="" stack="" trace="" silanis.esl.sdk.eslclient.createpackage="" this="" is="" how="" we="" are="" making="" the="" package:="" dim="" newpackage="" as="" documentpackage="" _="" .expireson="" day="" date="" variable="">) _ .WithEmailMessage("Test") _ .DescribedAs("Test") _ .Build() Dim PackageId As PackageId = Client.CreatePackage(NewPackage)