# The type does not contain a method with signature

**URL:** <https://discuss.hangfire.io/t/the-type-does-not-contain-a-method-with-signature/8616>\
**Category:** bug?\
**Tags:** queues\
**Created:** [August 4, 2021, 5:16pm UTC](https://discuss.hangfire.io/t/the-type-does-not-contain-a-method-with-signature/8616 "2021-08-04T17:16:10Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![tsmith](https://dub1.discourse-cdn.com/flex017/user_avatar/discuss.hangfire.io/tsmith/32/2648_2.png) [@tsmith](https://discuss.hangfire.io/u/tsmith)\
**Post date:** [August 4, 2021, 5:16pm UTC](https://discuss.hangfire.io/t/the-type-does-not-contain-a-method-with-signature/8616/1 "2021-08-04T17:16:10Z")

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It seems that when an exception occurs in a job it can trigger a type does not contain a method signature error. It some cases it resolves itself after a bit of time and in other cases it can exceed the retry limit and fail the job completely.

The original exception was a file locking issue seen at the bottom of the screenshot.

 ![hangfire-invalid-operation-exception](https://europe1.discourse-cdn.com/flex017/uploads/hangfire/original/2X/1/1943efa2217a37e92ef27c22afadc1d9cdc4bdc5.png)