# Could not get unknown property 'jar' for project ':core' of type org.gradle.ap i.Project
**URL:** https://discuss.elastic.co/t/could-not-get-unknown-property-jar-for-project-core-of-type-org-gradle-ap-i-project/98426
**Category:** Elasticsearch
**Created:** [August 26, 2017, 2:36am UTC](https://discuss.elastic.co/t/could-not-get-unknown-property-jar-for-project-core-of-type-org-gradle-ap-i-project/98426 "2017-08-26T02:36:27Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@saliormoon](https://discuss.elastic.co/u/saliormoon)
#### Post date: [August 26, 2017, 2:36am UTC](https://discuss.elastic.co/t/could-not-get-unknown-property-jar-for-project-core-of-type-org-gradle-ap-i-project/98426/1 "2017-08-26T02:36:27Z")
Elasticsearch version: 5.5.2
OS: Windlws
When I use gradle to build elasticsearch source code, I encounter a problem like this:
- What went wrong:
A problem occurred evaluating project ':distribution'.
> Could not get unknown property 'jar' for project ':core' of type org.gradle.ap
> i.Project.
I can't find ' org.gradle.api.Project' in build.gradle in elasticsearch-5.5.2\distribution.
Anyone can tell me how to understand this message?
---
### Author:  [@saliormoon](https://discuss.elastic.co/u/saliormoon)
#### Post date: [August 26, 2017, 3:19am UTC](https://discuss.elastic.co/t/could-not-get-unknown-property-jar-for-project-core-of-type-org-gradle-ap-i-project/98426/2 "2017-08-26T03:19:37Z")
This problem has been resolved. add {} to the build.gradle in elasticsearch-5.5.2\distribution
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [September 23, 2017, 3:20am UTC](https://discuss.elastic.co/t/could-not-get-unknown-property-jar-for-project-core-of-type-org-gradle-ap-i-project/98426/3 "2017-09-23T03:20:03Z")
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