removed all thrown errors from query serialisation workflow. all errors are reported via the field in the serialisation.
diff --git a/src/main/java/de/ids_mannheim/korap/query/serialize/util/CqlfObjectGenerator.java b/src/main/java/de/ids_mannheim/korap/query/serialize/util/CqlfObjectGenerator.java
index b03959d..abc4511 100644
--- a/src/main/java/de/ids_mannheim/korap/query/serialize/util/CqlfObjectGenerator.java
+++ b/src/main/java/de/ids_mannheim/korap/query/serialize/util/CqlfObjectGenerator.java
@@ -269,4 +269,4 @@
 		}
 		return number;
 	}
-}
+}
\ No newline at end of file
diff --git a/src/main/java/de/ids_mannheim/korap/query/serialize/util/QueryException.java b/src/main/java/de/ids_mannheim/korap/query/serialize/util/QueryException.java
deleted file mode 100644
index ff63f79..0000000
--- a/src/main/java/de/ids_mannheim/korap/query/serialize/util/QueryException.java
+++ /dev/null
@@ -1,36 +0,0 @@
-package de.ids_mannheim.korap.query.serialize.util;
-
-public class QueryException extends Exception {
-	
-  int errorCode;
-  
-  public QueryException() {
-      super();
-  }
-
-  public QueryException(String message) {
-      super(message);
-  }
-
-  public QueryException(String message, Throwable cause) {
-      super(message, cause);
-  };
-
-  public QueryException(Throwable cause) {
-      super(cause);
-  };  
-  
-  public QueryException(int code, String message) {	  
-	  super(message);
-	  setErrorCode(code);      
-  }
-
-  public int getErrorCode() {
-	return errorCode;
-  }
-
-  public void setErrorCode(int errorCode) {
-	this.errorCode = errorCode;
-  }
-
-};
diff --git a/src/main/java/de/ids_mannheim/korap/query/serialize/util/StatusCodes.java b/src/main/java/de/ids_mannheim/korap/query/serialize/util/StatusCodes.java
index 6fe6afd..ffdedf0 100644
--- a/src/main/java/de/ids_mannheim/korap/query/serialize/util/StatusCodes.java
+++ b/src/main/java/de/ids_mannheim/korap/query/serialize/util/StatusCodes.java
@@ -7,5 +7,6 @@
 	public final static int UNDEFINED_CLASS_REFERENCE = 304;
 	public final static int INCOMPATIBLE_OPERATOR_AND_OPERAND = 305;
 	public final static int UNKNOWN_QUERY_ELEMENT = 306;
+	public static final int UNKNOWN_QL = 307;
 	public final static int UNKNOWN_QUERY_ERROR = 399;
 }