diff --git a/Gemfile.lock b/Gemfile.lock
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -94,7 +94,6 @@
     coffee-script-source (1.12.2)
     concurrent-ruby (1.1.5)
     crass (1.0.4)
-    diff-lcs (1.3)
     dynamic_form (1.1.4)
     erubi (1.8.0)
     erubis (2.7.0)
@@ -211,23 +210,6 @@
     rdiscount (2.2.0.1)
     regexp_parser (1.5.1)
     rouge (3.3.0)
-    rspec-core (3.8.2)
-      rspec-support (~> 3.8.0)
-    rspec-expectations (3.8.4)
-      diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.8.0)
-    rspec-mocks (3.8.1)
-      diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.8.0)
-    rspec-rails (3.8.2)
-      actionpack (>= 3.0)
-      activesupport (>= 3.0)
-      railties (>= 3.0)
-      rspec-core (~> 3.8.0)
-      rspec-expectations (~> 3.8.0)
-      rspec-mocks (~> 3.8.0)
-      rspec-support (~> 3.8.0)
-    rspec-support (3.8.2)
     ruby-progressbar (1.10.0)
     ruby_dep (1.5.0)
     ruby_parser (3.13.1)
@@ -338,7 +320,6 @@
   rails_bootstrap_sortable
   rdiscount
   rouge
-  rspec-rails
   sassc-rails
   select2-rails
   selenium-webdriver
diff --git a/app/models/problem.rb b/app/models/problem.rb
--- a/app/models/problem.rb
+++ b/app/models/problem.rb
@@ -31,7 +31,7 @@
 
   def self.create_from_import_form_params(params, old_problem=nil)
     org_problem = old_problem || Problem.new
-    import_params, problem = Problem.extract_params_and_check(params, 
+    import_params, problem = Problem.extract_params_and_check(params,
                                                               org_problem)
 
     if !problem.errors.empty?
@@ -52,8 +52,8 @@
 
     importer = TestdataImporter.new(problem)
 
-    if not importer.import_from_file(import_params[:file], 
-                                     import_params[:time_limit], 
+    if not importer.import_from_file(import_params[:file],
+                                     import_params[:time_limit],
                                      import_params[:memory_limit],
                                      import_params[:checker_name],
                                      import_to_db)
diff --git a/app/views/problems/import.html.haml b/app/views/problems/import.html.haml
--- a/app/views/problems/import.html.haml
+++ b/app/views/problems/import.html.haml
@@ -8,7 +8,7 @@
 - if @problem and @problem.errors
   =error_messages_for 'problem'
 
-= simple_form_for :problem, url: do_import_problems_path, :multipart => true  do |f|
+= form_tag do_import_problems_path, :multipart => true  do |f|
 
   .submitbox
     %table
diff --git a/db/seeds.rb b/db/seeds.rb
--- a/db/seeds.rb
+++ b/db/seeds.rb
@@ -267,12 +267,12 @@
 
 def seed_more_languages
   Language.delete_all
-  Language.create( name: 'c', pretty_name: 'C', ext: 'c', common_ext: 'c' )
-  Language.create( name: 'cpp', pretty_name: 'C++', ext: 'cpp', common_ext: 'cpp,cc' )
-  Language.create( name: 'pas', pretty_name: 'Pascal', ext: 'pas', common_ext: 'pas' )
-  Language.create( name: 'ruby', pretty_name: 'Ruby', ext: 'rb', common_ext: 'rb' )
-  Language.create( name: 'python', pretty_name: 'Python', ext: 'py', common_ext: 'py' )
-  Language.create( name: 'java', pretty_name: 'Java', ext: 'java', common_ext: 'java' )
+  Language.find_or_create_by( name: 'c', pretty_name: 'C', ext: 'c', common_ext: 'c' )
+  Language.find_or_create_by( name: 'cpp', pretty_name: 'C++', ext: 'cpp', common_ext: 'cpp,cc' )
+  Language.find_or_create_by( name: 'pas', pretty_name: 'Pascal', ext: 'pas', common_ext: 'pas' )
+  Language.find_or_create_by( name: 'ruby', pretty_name: 'Ruby', ext: 'rb', common_ext: 'rb' )
+  Language.find_or_create_by( name: 'python', pretty_name: 'Python', ext: 'py', common_ext: 'py' )
+  Language.find_or_create_by( name: 'java', pretty_name: 'Java', ext: 'java', common_ext: 'java' )
 end
 
 seed_config
diff --git a/lib/testdata_importer.rb b/lib/testdata_importer.rb
--- a/lib/testdata_importer.rb
+++ b/lib/testdata_importer.rb
@@ -94,7 +94,7 @@
     testdata_filename = File.join(Dir.tmpdir,"#{@problem.name}#{ext}")
 
     return nil if tempfile==""
-    
+
     if tempfile.instance_of?(Tempfile)
       tempfile.close
       FileUtils.move(tempfile.path,testdata_filename)