# Elastic Observability Training Material - Possible Error

**URL:** <https://discuss.elastic.co/t/elastic-observability-training-material-possible-error/276484>\
**Category:** Elastic Training\
**Created:** [June 21, 2021, 6:46am UTC](https://discuss.elastic.co/t/elastic-observability-training-material-possible-error/276484 "2021-06-21T06:46:44Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Anabella\_Cristaldi](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/anabella_cristaldi/32/23612_2.png) [@Anabella\_Cristaldi](https://discuss.elastic.co/u/Anabella_Cristaldi)\
**Post date:** [June 21, 2021, 6:46am UTC](https://discuss.elastic.co/t/elastic-observability-training-material-possible-error/276484/1 "2021-06-21T06:46:44Z")

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Hi all,  
While I was reviewing the course's material in Extracting Data Types (page 181) it shows how to convert a token directly in the tokenizer ..

 ![image](https://us1.discourse-cdn.com/elastic/original/3X/6/9/691bac3cf85a6b4307b69f5da379e85451cea8f7.png)

The problem is that date is not a valid data type  
From the doc:

 ![image](https://us1.discourse-cdn.com/elastic/original/3X/d/4/d4fc5e4a9ddb79274edcc83c970a9d183f62a2a5.png)

In fact when I tried to use date as a convert\_datatype I get the following error when starting the beat

`Exiting: Failed to start crawler: starting input failed: Error while initializing input: invalid data type accessing 'filebeat.inputs.0.processors.0.dissect.tokenizer' (source:'filebeat.yml')`

Thank you very much  
Regards  
Anna

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<div class="post-metadata">

**Author:** ![Rich\_Raposa](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/rich_raposa/32/62078_2.png) [@Rich\_Raposa](https://discuss.elastic.co/u/Rich_Raposa)\
**Post date:** [June 21, 2021, 2:21pm UTC](https://discuss.elastic.co/t/elastic-observability-training-material-possible-error/276484/2 "2021-06-21T14:21:39Z")

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Thanks Anabella! I've opened a Github issue for this.

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [July 21, 2021, 2:22pm UTC](https://discuss.elastic.co/t/elastic-observability-training-material-possible-error/276484/3 "2021-07-21T14:22:04Z")

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