diff --git a/lib/teracy-dev/extension/manager.rb b/lib/teracy-dev/extension/manager.rb
index 07be0785..07ad5d43 100644
--- a/lib/teracy-dev/extension/manager.rb
+++ b/lib/teracy-dev/extension/manager.rb
@@ -30,7 +30,6 @@ def install(extensions)
         extensions.each do |extension|
           validate_dependencies(extension, extention_manifest_list) if Util.true?(extension['enabled'])
         end
-
         timer_end = Time.now
         @logger.debug("installation finished in #{timer_end - timer_start}s of extensions: #{extensions}")
       end
@@ -52,13 +51,20 @@ def sync(extension)
           "path" => path
         })
         sync_existing = extension['path']['lookup'] == DEFAULT_EXTENSION_LOOKUP_PATH
+
         Location::Manager.sync(extension['location'], sync_existing)
+
       end
 
       def validate(extension)
         return unless Util.true?(extension['enabled'])
 
-        manifest = Manager.manifest(extension)
+        begin
+          manifest = Manager.manifest(extension)
+        rescue Errno::ENOENT
+          @logger.error("manifest for extension #{extension['path']['extension']} not found, seem that you haven't synced all the required extensions. Please run vagrant <status|up|reload> to sync them first")
+          abort
+        end
 
         if !Util.exist?(manifest['name']) or !Util.exist?(manifest['version'])
           @logger.error("The extension manifest's name and version must be defined: #{manifest}, #{extension}")
diff --git a/lib/teracy-dev/location/manager.rb b/lib/teracy-dev/location/manager.rb
index 13e3bc5f..e68d46d5 100644
--- a/lib/teracy-dev/location/manager.rb
+++ b/lib/teracy-dev/location/manager.rb
@@ -9,9 +9,12 @@ class Manager
       @@logger = TeracyDev::Logging.logger_for(self)
 
       # return true if sync action is carried out, otherwise, return false
-      def self.sync(location, sync_existing = true)
+      def self.sync(location, sync_existing = true, force = false)
         updated = false
         timer_start = Time.now
+        if !force && !cmdRequireSync?
+          return false
+        end
         @@synch_list.each do |synch|
           if synch.sync(location, sync_existing) == true
             updated = true
@@ -21,6 +24,10 @@ def self.sync(location, sync_existing = true)
         @@logger.debug("sync finished in #{timer_end - timer_start}s with updated: #{updated}, location: #{location}")
         updated
       end
+
+      def self.cmdRequireSync?
+        return ARGV.include?('up') || ARGV.include?('status') || ARGV.include?('reload')
+      end
     end
   end
 end