Problem using API with plural translations

var dict = new Dictionary<string, int>();
dict["MATCHES_LEFT"] = 5;
string translation = LocalizationManager.GetTranslation( "TERM_FIGHTS" )
LocalizationManager.ApplyParameters(ref translation, dict);

string translation = LocalizationManager.GetTranslation( "TERM_FIGHTS" )
LocalizationManager.ApplyParameters(ref translation, (p)=>{ return p=="MATCHES_LEFT" ? 5 : null; });

string translation = LocalizationManager.GetTranslation(".STARS. needed to unlock");
        LocalizationManager.ApplyLocalizationParams(ref translation, (p) => { return p == "NR" ? 5 : 0; });

var dict = new Dictionary<string, object>();
        dict["NR"] = Contract.StarsNeed2Unlock;
        string translation = LocalizationManager.GetTranslation(".STARS. needed to unlock");
        LocalizationManager.ApplyLocalizationParams(ref translation, parameters:dict);

InvalidCastException: Specified cast is not valid.
I2.Loc.LocalizationManager.ApplyLocalizationParams (System.String& translation, I2.Loc.LocalizationManager+_GetParam getParam, System.Boolean allowLocalizedParameters) (at Assets/I2/Localization/Scripts/Manager/LocalizationManager_Parameters.cs:84)
I2.Loc.LocalizationManager.ApplyLocalizationParams (System.String& translation, System.Collections.Generic.Dictionary`2[TKey,TValue] parameters, System.Boolean allowLocalizedParameters) (at Assets/I2/Localization/Scripts/Manager/LocalizationManager_Parameters.cs:46)
ContractUI.OnLocalize () (at Assets/Scripts/UI/ContractUI.cs:67)

var result = (string)getParam(param); where param has the value NR