diff --git a/Gemfile b/Gemfile
index 5288edd52..ab7a41a16 100644
--- a/Gemfile
+++ b/Gemfile
@@ -49,9 +49,9 @@ group :development, :test do
 	gem 'guard-spork', '~> 1.5.1'
 	gem 'guard-test', '~> 1.0.0'
 	gem 'ruby-prof', '~> 0.15.1' unless RUBY_PLATFORM =~ /w32/
-	gem 'pry'
-	gem 'pry-nav'
-
+	gem 'pry-rails'
+  gem 'pry-byebug'
+  gem 'pry-remote'
 end
 
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 58f069ac1..d2ae03453 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -57,6 +57,9 @@ GEM
       ice_nine (~> 0.11.0)
       thread_safe (~> 0.3, >= 0.3.1)
     builder (3.0.0)
+    byebug (2.7.0)
+      columnize (~> 0.3)
+      debugger-linecache (~> 1.2)
     capybara (2.4.1)
       mime-types (>= 1.16)
       nokogiri (>= 1.3.3)
@@ -81,6 +84,8 @@ GEM
       coffee-script-source
       execjs
     coffee-script-source (1.7.1)
+    columnize (0.9.0)
+    debugger-linecache (1.2.0)
     descendants_tracker (0.0.4)
       thread_safe (~> 0.3, >= 0.3.1)
     equalizer (0.0.9)
@@ -170,8 +175,14 @@ GEM
       method_source (~> 0.8)
       slop (~> 3.4)
       win32console (~> 1.3)
-    pry-nav (0.2.3)
-      pry (~> 0.9.10)
+    pry-byebug (1.3.2)
+      byebug (~> 2.7)
+      pry (~> 0.9.12)
+    pry-rails (0.3.2)
+      pry (>= 0.9.10)
+    pry-remote (0.1.8)
+      pry (~> 0.9)
+      slop (~> 3.0)
     puma (2.10.1)
       rack (>= 1.1, < 2.0)
     rack (1.4.5)
@@ -305,8 +316,9 @@ DEPENDENCIES
   net-ldap (~> 0.3.1)
   nokogiri (~> 1.6.3)
   paperclip (~> 3.5.4)
-  pry
-  pry-nav
+  pry-byebug
+  pry-rails
+  pry-remote
   puma
   rack-mini-profiler!
   rack-openid
diff --git a/app/api/mobile/apis/users.rb b/app/api/mobile/apis/users.rb
index c9ecdd84f..489b3e419 100644
--- a/app/api/mobile/apis/users.rb
+++ b/app/api/mobile/apis/users.rb
@@ -17,7 +17,7 @@ module Mobile
         begin
           user = us.register params.merge(:password_confirmation => params[:password],
                                           :should_confirmation_password => true)
-          raise "register failed." if user.new_record?
+          raise "register failed #{user.errors.full_messages}" if user.new_record?
           {status: 0, data: user}
         rescue => e
           {status: 1, message: e.message}