diff --git a/perl-xCAT-2.0/xCAT/NotifHandler.pm b/perl-xCAT-2.0/xCAT/NotifHandler.pm
index b8856a1b9..b31c8347f 100644
--- a/perl-xCAT-2.0/xCAT/NotifHandler.pm
+++ b/perl-xCAT-2.0/xCAT/NotifHandler.pm
@@ -296,16 +296,23 @@ sub notify {
     my ($modname, $path, $suffix) = fileparse($_, ".pm");
      # print "modname=$modname, path=$path, suffix=$suffix\n";
     if ($suffix =~ /.pm/) { #it is a perl module
-      my $pid;
+      my $pid; 
       if ($pid=fork()) { }
       elsif (defined($pid)) {
+	my $fname;
         if (($path eq "") || ($path eq ".\/")) {
           #default path is /opt/xcat/lib/perl/xCAT_monitoring/ if there is no path specified
-          require "$::XCATROOT/lib/perl/xCAT_monitoring/".$modname.".pm";
+          $fname = "$::XCATROOT/lib/perl/xCAT_monitoring/".$modname.".pm";
         } else {
-          require $_;
+          $fname = $_;
+        }
+        eval {require($fname)};
+        if ($@) {   
+          print "The file $fname cannot be located or has compiling errors.\n";          
+        }
+        else {
+          ${"xCAT_monitoring::".$modname."::"}{processTableChanges}->($action, $tablename, $old_data, $new_data);
         }
-        ${"xCAT_monitoring::".$modname."::"}{processTableChanges}->($action, $tablename, $old_data, $new_data);
         exit 0;
       }
     }
diff --git a/xCAT-server-2.0/lib/xcat/monitoring/monitorctrl.pm b/xCAT-server-2.0/lib/xcat/monitoring/monitorctrl.pm
index 2e444f8e6..ff46c6924 100644
--- a/xCAT-server-2.0/lib/xcat/monitoring/monitorctrl.pm
+++ b/xCAT-server-2.0/lib/xcat/monitoring/monitorctrl.pm
@@ -370,7 +370,16 @@ sub stopMonitoring {
       my $file_name="$::XCATROOT/lib/perl/xCAT_monitoring/" . lc($_) . "mon.pm";
       $module_name="xCAT_monitoring::" . lc($_) . "mon";
       #load the module in memory
-      require $file_name;      
+      eval {require($file_name)};
+      if ($@) {   
+        my @ret3=(1, "The file $file_name cannot be located or has compiling errors.\n"); 
+        $ret{$_}=\@ret3;
+        next;
+      }
+      else {
+        my @a=($file_name, $module_name);
+        $PRODUCT_LIST{$pname}=\@a;
+      }
     }      
     #stop monitoring
     my @ret2 = ${$module_name."::"}{stop}->();
@@ -412,7 +421,14 @@ sub stopNodeStatusMonitoring {
       my $file_name="$::XCATROOT/lib/perl/xCAT_monitoring/" . lc($pname) . "mon.pm";
       $module_name="xCAT_monitoring::" . lc($pname) . "mon";
       #load the module in memory
-      require $file_name;      
+      eval {require($file_name)};
+      if ($@) {   
+        return (1, "The file $file_name cannot be located or has compiling errors.\n"); 
+      }
+      else {
+        my @a=($file_name, $module_name);
+        $PRODUCT_LIST{$pname}=\@a;
+      }
     }
     
     my @ret2 = ${$module_name."::"}{stopNodeStatusMon}->(); 
@@ -702,10 +718,14 @@ sub refreshProductList {
         $file_name="$::XCATROOT/lib/perl/xCAT_monitoring/" . lc($pname) . "mon.pm";
         $module_name="xCAT_monitoring::" . lc($pname) . "mon";
         #load the module in memory
-        require $file_name;
-     
-        my @a=($file_name, $module_name);
-        $PRODUCT_LIST{$pname}=\@a;
+        eval {require($file_name)};
+        if ($@) {   
+          print "The file $file_name cannot be located or has compiling errors.\n"; 
+        }
+        else {
+          my @a=($file_name, $module_name);
+          $PRODUCT_LIST{$pname}=\@a;
+        }
       } 
     }
   }
diff --git a/xCAT-server-2.0/lib/xcat/monitoring/xcatmon.pm b/xCAT-server-2.0/lib/xcat/monitoring/xcatmon.pm
index f53067e2b..270b874a8 100644
--- a/xCAT-server-2.0/lib/xcat/monitoring/xcatmon.pm
+++ b/xCAT-server-2.0/lib/xcat/monitoring/xcatmon.pm
@@ -3,7 +3,7 @@
 package xCAT_monitoring::xcatmon;
 BEGIN
 {
-    $::XCATROOT = $ENV{'XCATROOT'} ? $ENV{'XCATROOT'} : '/opt/xcat';
+  $::XCATROOT = $ENV{'XCATROOT'} ? $ENV{'XCATROOT'} : '/opt/xcat';
 }
 use lib "$::XCATROOT/lib/perl";
 #use xCAT::NodeRange;