Creating a MoreLikeThis query yields empty queries and terms - lucene

Question

I'm trying to get similar Document of another one . I'm using the Lucene.Net MoreLikeThis-Class to achieve this. For this i seperate my Documents in multiple Fields - Title and Content. Now creating the actual query results in an empty query without interesting Terms.
My could looks like this:
var queries = new List<Query>();
foreach(var docField in docFields)
var similarSearch = new MoreLikeThis(indexReader);
similarSearch.SetFieldNames(docField.fieldName);
similarSearch.Analyzer = new GermanAnalyzer(Version.LUCENE_30, new HashSet<string>(StopWords));
similarSearch.MinDocFreq = 1;
similarSearch.MinTermFreq = 1;
similarSearch.MinWordLen = 1;
similarSearch.Boost = true;
similarSearch.BoostFactor = boostFactor;
using(var reader = new StringReader(docField.Content)){
var searchQuery = similarSearch.Like(reader);
// debugging purpose
var queryString = searchQuery.ToString(); // empty
var terms = similarSearch.RetrieveInterestingTerms(reader); // also empty
queries.Add(searchQuery);
}
var booleanQuery = new BooleanQuery();
foreach(var moreLikeThisQuery in queries)
{
booleanQuery.Add(moreLikeThisQuery, Occur.SHOULD);
}
var topDocs = indexSearcher.Search(booleanQuery, maxNumberOfResults); // and of course no results obtained
So the question is:
Why there are no Terms / why there is no query generated?
I hope important thing's be seen, if not please help me to make my first question better :)

Answer 1

I got it to work.
The problem was, that i worked on the false directory.
I have different Solutions for creating the index and creating the queries and had a missmatch with the index-location.
So the generall solution would be:
Is your Querygenerating-Class fully initialized? (MinDocFreq, MinTermFreq, MinWordLen, has a Analyzer, set the fieldNames)
Is your used IndexReader correctly initialized?