### Author:  [@greenhorn](https://discuss.elastic.co/u/greenhorn)
#### Post date: [January 25, 2018, 6:52pm UTC](https://discuss.elastic.co/t/could-not-load-cant-convert-nil-into-string/117101/1 "2018-01-25T18:52:39Z")
When I use
```
output {
stdout { codec => rubydebug }
}
```
I end up filling up my logs files with the following.
Could not load : can't convert nil into String
My configuration is as follows.
>
Grok Pattern File
CISCOTIMESTAMPTZ %{MONTH} +%{MONTHDAY}(?: %{YEAR})? %{TIME} %{TZ}
If I run without rubydebug I end up getting a grok parse failure on all of my IOS logs.
Any help would be appreciated. I am running logstash-5.4.0-1.
---
### Author:  [@magnusbaeck](https://discuss.elastic.co/u/magnusbaeck)
#### Post date: [January 25, 2018, 9:20pm UTC](https://discuss.elastic.co/t/could-not-load-cant-convert-nil-into-string/117101/2 "2018-01-25T21:20:09Z")
Please show the full error message (and maybe with some preceding lines for context).
---
### Author:  [@greenhorn](https://discuss.elastic.co/u/greenhorn)
#### Post date: [January 25, 2018, 9:28pm UTC](https://discuss.elastic.co/t/could-not-load-cant-convert-nil-into-string/117101/3 "2018-01-25T21:28:35Z")
This is literally the whole message.
Could not load : can't convert nil into String
Could not load : can't convert nil into String
Could not load : can't convert nil into String
Could not load : can't convert nil into String
Could not load : can't convert nil into String
Could not load : can't convert nil into String
Could not load : can't convert nil into String
Could not load : can't convert nil into String
Could not load : can't convert nil into String
Could not load : can't convert nil into String
Could not load : can't convert nil into String
Could not load : can't convert nil into String
Could not load : can't convert nil into String
Could not load : can't convert nil into String
Could not load : can't convert nil into String
Could not load : can't convert nil into String
Could not load : can't convert nil into String
Could not load : can't convert nil into String
Could not load : can't convert nil into String
Could not load : can't convert nil into String
Could not load : can't convert nil into String
Could not load : can't convert nil into String
Could not load : can't convert nil into String
Could not load : can't convert nil into String
Could not load : can't convert nil into String
If you can recommend elsewhere to look I will be happy to pull any and all logs needed.
---
### Author:  [@greenhorn](https://discuss.elastic.co/u/greenhorn)
#### Post date: [January 25, 2018, 9:32pm UTC](https://discuss.elastic.co/t/could-not-load-cant-convert-nil-into-string/117101/4 "2018-01-25T21:32:37Z")
I will restart in debug and see if I cannot get some more detail.
---
### Author:  [@greenhorn](https://discuss.elastic.co/u/greenhorn)
#### Post date: [January 25, 2018, 9:39pm UTC](https://discuss.elastic.co/t/could-not-load-cant-convert-nil-into-string/117101/5 "2018-01-25T21:39:43Z")
Sorry no additional detail with debug on.
---
### Author:  [@greenhorn](https://discuss.elastic.co/u/greenhorn)
#### Post date: [January 25, 2018, 10:07pm UTC](https://discuss.elastic.co/t/could-not-load-cant-convert-nil-into-string/117101/6 "2018-01-25T22:07:54Z")
What is fairly confusing to me is why it would happen once rubydebug is enabled and why I cannot process IOS(Cisco) logs without it. The rest of my logs are processed without issue and that is around 120K per minute. Any ideas?
---
### Author:  [@greenhorn](https://discuss.elastic.co/u/greenhorn)
#### Post date: [January 29, 2018, 7:02pm UTC](https://discuss.elastic.co/t/could-not-load-cant-convert-nil-into-string/117101/7 "2018-01-29T19:02:34Z")
I was able to distill my config down into the following and am still receiving the error. Any help would be appreciated.
```
input {
beats {
port => 5044
ssl => false
}
}
output {
elasticsearch {
hosts => ['xxxxxxxxxxxxxx:9200','xxxxxxxxxxxxxx:9200']
sniffing => true
manage_template => false
index => "filebeat-%{+YYYY.MM.dd}"
document_type => "%{[@metadata][type]}"
}
stdout { codec => rubydebug }
}
```
---
### Author:  [@magnusbaeck](https://discuss.elastic.co/u/magnusbaeck)
#### Post date: [January 29, 2018, 8:57pm UTC](https://discuss.elastic.co/t/could-not-load-cant-convert-nil-into-string/117101/8 "2018-01-29T20:57:33Z")
I'm pretty sure it's a Logstash bug (either in the core or in one of the plugins). I think it has come up before but I wasn't able to find a GitHub issue for it.
---
### Author:  [@greenhorn](https://discuss.elastic.co/u/greenhorn)
#### Post date: [January 29, 2018, 9:08pm UTC](https://discuss.elastic.co/t/could-not-load-cant-convert-nil-into-string/117101/9 "2018-01-29T21:08:52Z")
Thank Magnus. I have seen some of the bugs also and would agree. I will create a bug issue for the problem. I believe the issue is with awesome\_print.
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [February 26, 2018, 9:23pm UTC](https://discuss.elastic.co/t/could-not-load-cant-convert-nil-into-string/117101/10 "2018-02-26T21:23:22Z")
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