src/core/org/luaj/vm2/LuaClosure.java

@@ -548,7 +548,7 @@ public class LuaClosure extends LuaFunction {
 
 	private void processErrorHooks(LuaError le, Prototype p, int pc) {
 		le.fileline = (p.source != null? p.source.tojstring(): "?") + ":"
-			+ (p.lineinfo != null && pc >= 0 && pc < p.lineinfo.length? String.valueOf(p.lineinfo[pc]): "?");
+			+ (p.lineinfo != null && pc >= 0 && pc < p.lineinfo.length? String.valueOf(p.lineinfo[pc]): "?") + ": ";
 		le.traceback = errorHook(le.getMessage(), le.level);
 	}
 	

src/core/org/luaj/vm2/LuaError.java

@@ -61,7 +61,7 @@ public class LuaError extends RuntimeException {
 		if (m == null)
 			return null;
 		if (fileline != null)
-			return fileline + " " + m;
+			return fileline + m;
 		return m;
 	}