diff -u -r1.12 -r1.13
--- ConditionsReader.java	20 Aug 2008 01:00:45 -0000	1.12
+++ ConditionsReader.java	30 Mar 2009 22:49:07 -0000	1.13
@@ -112,6 +112,11 @@

 				if (url.getProtocol().equals("file") && (url.getHost() == null || url.getHost().length() == 0))
 				{					
 					File file = new File(url.getPath());

+					// Check if exists.
+					if (!file.exists())
+					{
+						throw new RuntimeException("The URL " + url.toString() + " used by detector " + name + " does not exist.");
+					}

 					if (file.isDirectory()) return new DirectoryConditionsReader(file);
 					else return new ZipConditionsReader(file);
 				}

@@ -128,12 +133,14 @@

 				File zipFile = new File(detectorDir,name+".zip");
 				if (zipFile.exists()) return new ZipConditionsReader(zipFile);
 				File dirFile = new File(detectorDir,name);

-				if (dirFile.exists() && dirFile.isDirectory()) {

+				if (dirFile.exists() && dirFile.isDirectory()) 
+				{

 					return new DirectoryConditionsReader(dirFile);
 				}
 
 				// Search the classpath from the base package.

-				try { 					

+				try 
+				{ 					

 					return new BaseClasspathConditionsReader(name);
 				}
 				catch (IOException x)

@@ -267,7 +274,7 @@

 		InputStream open(String name, String type) throws IOException
 		{
 			File file = new File(dir,name+"."+type);

-			if (!file.exists()) throw new IOException("Conditions "+name+"."+type+" not found");

+			if (!file.exists()) throw new IOException("Conditions "+name+"."+type+" not found, because directory " + file.getAbsolutePath() + " does not exist.");

 			return new BufferedInputStream(new FileInputStream(file));
 		}
 		void close() throws IOException

@@ -277,7 +284,7 @@

 
 	/**
 	 * This ConditionsReader finds detector conditions with the assumption that the conditions are located in a package called <code>detectorName</code>.

-	 * This ConditionsReader will work if lcsim-detector jar from the LCDetectors project is on the classpath.

+	 * This ConditionsReader will work if the lcsim-detector jar from the LCDetectors project is on the classpath.

 	 */
 	private static class BaseClasspathConditionsReader extends ConditionsReader
 	{

@@ -307,7 +314,6 @@

 		}
 
 		void close() throws IOException

-		{
-		}

+		{}

 	}
 }