Dont know if the error is the same as some other here, thats why open a new post.

Can anyone help me to fix it ?

Server was unable to process request. —> This access control list is not in canonical form and therefore cannot be modified.
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.OrganizationController.CreateOrganization(Int32 packageId, String organizationId, String organizationName, String domainName)

Selected answer as best