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# Conversion Exceptions

#### Experimental!

Conversion is an experimental, innovative, and rapidly changing new feature for App Engine. Unfortunately, being on the bleeding edge means that we may make backwards-incompatible changes to Conversion. We will inform the community when this feature is no longer experimental.

The Conversion API can raise the following exceptions:

Error
  Base class for exceptions in this module.
InvalidRequest
  Request not properly formed.
ConversionUnsupported
  Unsupported conversion attempted.
ConversionTooLarge
  Conversion too large.
TooManyConversions
  Too many conversions in request.
BackendError
  Error in backend that can't be sent back to application.
BackendDeadlineExceeded
  Communication to backend service timed out.
TransientError
  Transient error while accessing backend, try again later.