{Redmine.Net.Api.Exceptions.RedmineException: UpdateObject has invalid or missing attribute parameters: Assignee is invalid ---> System.Net.WebException: The remote server returned an error: (422) Unprocessable Entity . at System.Net.HttpWebRequest.GetResponse() at System.Net.WebClient.GetWebResponse(WebRequest request) at System.Net.WebClient.DownloadBits(WebRequest request, Stream writeStream) at System.Net.WebClient.UploadBits(WebRequest request, Stream readStream, Byte[] buffer, Int32 chunkSize, Byte[] header, Byte[] footer) at System.Net.WebClient.UploadDataInternal(Uri address, String method, Byte[] data, WebRequest& request) at System.Net.WebClient.UploadString(Uri address, String method, String data) at System.Net.WebClient.UploadString(String address, String method, String data) at Redmine.Net.Api.Internals.WebApiHelper.ExecuteUpload(RedmineManager redmineManager, String address, String actionType, String data, String methodName, NameValueCollection parameters) --- End of inner exception stack trace --- at Redmine.Net.Api.Extensions.WebExtensions.HandleWebException(WebException exception, String method, MimeFormat mimeFormat) at Redmine.Net.Api.Internals.WebApiHelper.ExecuteUpload(RedmineManager redmineManager, String address, String actionType, String data, String methodName, NameValueCollection parameters) at Redmine.Net.Api.RedmineManager.UpdateObject[T](String id, T obj, String projectId) at Redmine.Net.Api.RedmineManager.UpdateObject[T](String id, T obj) at ChatBot.RedmineAPI.IssuesBll.UpdatePropertiesOfIssues(String issueId, String account) in D:\QuiBQ\ChatBot Documentation\ChatBot Documentation\ChatBot\RedmineAPI\IssuesBll.cs:line 184} 0901 414 666