JPath for Generic Template not writing to json file. about amp HOT 2 OPEN

[15:51:32] [API:admin Activity]   : Changing setting Meta.GenericModule.UserName to Jonathan1
[15:51:33] [Generic:admin Info]   : Merging config file ./openrct2/server/user-data/config.ini (INI format) using Unicode (UTF-8) encoding.
[15:51:33] [Core:admin Warning]   : Returned exception from API call Core/SetConfig
[15:51:33] [Core:admin Error]     : ArgumentNullException
[15:51:33] [Core:admin Error]     : [0] (ArgumentNullException) : Value cannot be null.
Parameter name: input
[15:51:33] [Core:admin Error]     :    at Text.RegularExpressions.Regex.Replace(String input, MatchEvaluator evaluator)
   at GenericModule.GenericModuleConfig.ApplicationConfig.SubstituteTemplates(String input, Dictionary`2 variables)
   at GenericModule.ModuleMain.MergeINI(String finalPath, MetaConfigFile fileInfo)
   at GenericModule.ModuleMain.WriteMetaconfigs()
   at GenericModule.ModuleMain.SaveChanges(String key, String value)
   at GSMyAdmin.WebServer.WebMethods.UpdateSetting(String node, String value, SettingCacheEntry entry, SettingSpec cache)
   at GSMyAdmin.WebServer.WebMethods.SetConfig(String node, String value)
   at GSMyAdmin.WebServer.WebAttributes.<InvokeMethod>()
   at GSMyAdmin.WebServer.APIService.<InvokeAPI>()