# py4j.protocol.Py4JNetworkError: Answer from Java side is empty: hail, download files

**URL:** <https://discuss.hail.is/t/py4j-protocol-py4jnetworkerror-answer-from-java-side-is-empty-hail-download-files/1069>\
**Category:** Hail Query & hailctl\
**Created:** [September 3, 2019, 4:21pm UTC](https://discuss.hail.is/t/py4j-protocol-py4jnetworkerror-answer-from-java-side-is-empty-hail-download-files/1069 "2019-09-03T16:21:42Z")\
**Posts on this page:** 1\
**Showing post:** 19

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**Author:** ![danking](https://yyz2.discourse-cdn.com/flex036/user_avatar/discuss.hail.is/danking/32/43_2.png) [@danking](https://discuss.hail.is/u/danking)\
**Post date:** [November 29, 2021, 2:44pm UTC](https://discuss.hail.is/t/py4j-protocol-py4jnetworkerror-answer-from-java-side-is-empty-hail-download-files/1069/19 "2021-11-29T14:44:05Z")

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A post was split to a new topic: [While running a GWAS / linear regression I get: “Answer from Java side empty” and “undefined symbol: cblas\_dgemv”](https://discuss.hail.is/t/while-running-a-gwas-linear-regression-i-get-answer-from-java-side-empty-and-undefined-symbol-cblas-dgemv/2375)

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_[View the full topic](https://discuss.hail.is/t/py4j-protocol-py4jnetworkerror-answer-from-java-side-is-empty-hail-download-files/1069)._