New Post: Search.SearchTweets(searchParameter) stopped working

I have the following code:

var searchParameter = Search.GenerateSearchTweetParameter("#RallyFan");

searchParameter.SearchType = SearchResultType.Mixed;
searchParameter.MaximumNumberOfResults = 500;
searchParameter.Since = new DateTime(2015, 1, 1);
searchParameter.TweetSearchFilter = TweetSearchFilter.OriginalTweetsOnly;

var resultSet = Search.SearchTweets(searchParameter);

The last line gets throws this error:

Object reference not set to an instance of an object

When I use your example:

// Complex search
var searchParameter = Search.GenerateSearchTweetParameter("tweetinvi");
searchParameter.SetGeoCode(-122.398720, 37.781157, 1, DistanceMeasure.Miles);
searchParameter.Lang = Language.English;
searchParameter.SearchType = SearchResultType.Popular;
searchParameter.MaximumNumberOfResults = 100;
searchParameter.Until = new DateTime(2013, 12, 1);
searchParameter.SinceId = 399616835892781056;
searchParameter.MaxId = 405001488843284480;

var resultSet = Search.SearchTweets(searchParameter);

This gives me the following error:

Value cannot be null

Everything was working fine, I've done nothing and it doesn't work anymore. Any ideas?