SolidCP is not working with SAML authentication provider.

An error occurred while creating SharePoint site collection.
System.Web.Services.Protocols.SoapException: Server was unable to process request. ---> System.Exception: Error executing 'ADD_SITE_COLLECTION' task on 'https://test.test.com' HOSTED_SHAREPOINT_ENTERPRISE ---> System.Web.Services.Protocols.SoapException: System.Web.Services.Protocols.SoapException: Server was unable to process request. ---> Microsoft.SharePoint.SPException: User cannot be found. Server stack trace: at Microsoft.SharePoint.Administration.SPSiteCollection.Add(SPContentDatabase database, SPSiteSubscription siteSubscription, String siteUrl, String title, String description, UInt32 nLCID, Int32 compatibilityLevel, String webTemplate, String ownerLogin, String ownerName, String ownerEmail, String secondaryContactLogin, String secondaryContactName, String secondaryContactEmail, String quotaTemplate, String sscRootWebUrl, Boolean useHostHeaderAsSiteName, Boolean overrideCompatibilityRestriction) at Microsoft.SharePoint.Administration.SPSiteCollection.Add(SPContentDatabase database, SPSiteSubscription siteSubscription, String siteUrl, String title, String description, UInt32 nLCID, Int32 compatibilityLevel, String webTemplate, String ownerLogin, String ownerName, String ownerEmail, String secondaryContactLogin, String secondaryContactName, String secondaryContactEmail, String quotaTemplate, String sscRootWebUrl, Boolean useHostHeaderAsSiteName) at Microsoft.SharePoint.Administration.SPSiteCollection.Add(SPSiteSubscription siteSubscription, String siteUrl, String title, String description, UInt32 nLCID, Int32 compatibilityLevel, String webTemplate, String ownerLogin, String ownerName, String ownerEmail, String secondaryContactLogin, String secondaryContactName, String secondaryContactEmail, Boolean useHostHeaderAsSiteName) at SolidCP.Providers.HostedSolution.HostedSharePointServer2013EntImpl.CreateCollection(Runspace runspace, Uri rootWebApplicationUri, SharePointEnterpriseSiteCollection siteCollection) at SolidCP.Providers.HostedSolution.HostedSharePointServer2013EntImpl.CreateSiteCollection(Uri rootWebApplicationUri, SharePointEnterpriseSiteCollection siteCollection) at System.Runtime.Remoting.Messaging.StackBuilderSink._PrivateProcessMessage(IntPtr md, Object[] args, Object server, Object[]& outArgs) at System.Runtime.Remoting.Messaging.StackBuilderSink.SyncProcessMessage(IMessage msg) Exception rethrown at [0]: at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg) at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type) at SolidCP.Providers.HostedSolution.HostedSharePointServer2013EntImpl.CreateSiteCollection(Uri rootWebApplicationUri, SharePointEnterpriseSiteCollection siteCollection) at SolidCP.Providers.HostedSolution.HostedSharePointServer2013Ent.<>c__DisplayClass5.b__4(HostedSharePointServer2013EntImpl impl) at SolidCP.Providers.HostedSolution.HostedSharePointServer2013Ent.ExecuteSharePointAction[TReturn](SharePointAction`1 action) at SolidCP.Server.HostedSharePointServerEnt.<>c__DisplayClass6.b__5() at SolidCP.Server.HostedSharePointServerEnt.ExecuteAction[TReturn](Action`1 action, String actionName) --- End of inner exception stack trace --- at System.Web.Services.Protocols.SoapHttpClientProtocol.ReadResponse(SoapClientMessage message, WebResponse response, Stream responseStream, Boolean asyncCall) at System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke(String methodName, Object[] parameters) at SolidCP.EnterpriseServer.Code.SharePoint.HostedSharePointServerEntController.AddSiteCollection(SharePointEnterpriseSiteCollection item) --- End of inner exception stack trace --- at SolidCP.EnterpriseServer.Code.SharePoint.HostedSharePointServerEntController.AddSiteCollection(SharePointEnterpriseSiteCollection item) at SolidCP.EnterpriseServer.esHostedSharePointServersEnt.Enterprise_AddSiteCollection(SharePointEnterpriseSiteCollection item) --- End of inner exception stack trace ---