# Logstash does not start after upgrade from 6.1.2 to 6.4.0
**URL:** https://discuss.elastic.co/t/logstash-does-not-start-after-upgrade-from-6-1-2-to-6-4-0/148478
**Category:** Logstash
**Created:** [September 13, 2018, 4:04pm UTC](https://discuss.elastic.co/t/logstash-does-not-start-after-upgrade-from-6-1-2-to-6-4-0/148478 "2018-09-13T16:04:45Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@t\_kauf](https://discuss.elastic.co/u/t_kauf)
#### Post date: [September 13, 2018, 4:04pm UTC](https://discuss.elastic.co/t/logstash-does-not-start-after-upgrade-from-6-1-2-to-6-4-0/148478/1 "2018-09-13T16:04:45Z")
Hi,
today I upgraded my Elasticstack from Version 6.1.2 to 6.4.0.
Since then Logstash does not start correctly anymore.
I have pasted the logs / output here: [https://paste.fedoraproject.org/paste/IR-6sdrXbmRgKgj5QNRbGw](https://paste.fedoraproject.org/paste/IR-6sdrXbmRgKgj5QNRbGw)
because it exceeds the 7000 character limit of forum posts.
But unfortunately I cannot interpret that error and have no idea what the log is trying to tell me.
Has anybody seen that error and knows a fix or can give me hints or tips how to further investigate / narrow down the problem?
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [October 11, 2018, 4:04pm UTC](https://discuss.elastic.co/t/logstash-does-not-start-after-upgrade-from-6-1-2-to-6-4-0/148478/2 "2018-10-11T16:04:48Z")
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