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-rw-r--r--lib/mogilefs.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/mogilefs.rb b/lib/mogilefs.rb
index d20f0f9..e05d289 100644
--- a/lib/mogilefs.rb
+++ b/lib/mogilefs.rb
@@ -46,6 +46,8 @@ module MogileFS
   # Raised when all known backends have failed.
   class UnreachableBackendError < Error; end
 
+  class BackendPipelineError < Error; end
+
   # IO.copy_stream was buggy in Ruby 1.9.2 and earlier
   if RUBY_VERSION >= "1.9.3"
     X = IO