# Invalid FieldReference
**URL:** https://discuss.elastic.co/t/invalid-fieldreference/178721
**Category:** Logstash
**Created:** [April 26, 2019, 8:11pm UTC](https://discuss.elastic.co/t/invalid-fieldreference/178721 "2019-04-26T20:11:20Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@Samvid\_Kulkarni](https://discuss.elastic.co/u/Samvid_Kulkarni)
#### Post date: [April 26, 2019, 8:11pm UTC](https://discuss.elastic.co/t/invalid-fieldreference/178721/1 "2019-04-26T20:11:20Z")
I have a field named AccountName which has values like this `abc$, abc234$` (just two values in field).
i am using mutate filter to split it into parts and then use add\_field to insert values into another field. I have logstash, elasticsearch and kibana version 7.0 and [I am following tutorial to do it which is made specifically towards 7.0.](https://www.elastic.co/guide/en/logstash/current/plugins-filters-mutate.html#_description_131)
here is my script
```
mutate {
split => ["AccountName", ","]
add_field => { "AccountName1" => "%{AccountName[0]}" }
add_field => { "AccountName2" => "%{AccountName[1]}" }
remove_field => [AccountName]
}
if [AccountName2] == "%{AccountName[1]}"
{
mutate {
replace => { "AccountName2" => "-" }
}
}
if [AccountName1] == "%{AccountName[0]}"
{
mutate {
replace => { "AccountName1" => "-" }
}
}
```
It was working just fine for previous versions but now it is not working. I am getting following error. I dont get whats wrong with my code.
> [2019-04-26T11:03:05,919][FATAL][logstash.runner] An unexpected error occurred! {:error=\>java.lang.IllegalStateException: org.logstash.FieldReference$IllegalSyntaxException: Invalid FieldReference: `AccountName[0]`, :backtrace=\>["org.logstash.execution.WorkerLoop.run(org/logstash/execution/WorkerLoop.java:85)", "jdk.internal.reflect.GeneratedMethodAccessor33.invoke(jdk/internal/reflect/GeneratedMethodAccessor33)", "jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(jdk/internal/reflect/DelegatingMethodAccessorImpl.java:43)", "java.lang.reflect.Method.invoke(java/lang/reflect/Method.java:566)", "org.jruby.javasupport.JavaMethod.invokeDirectWithExceptionHandling(org/jruby/javasupport/JavaMethod.java:440)", "org.jruby.javasupport.JavaMethod.invokeDirect(org/jruby/javasupport/JavaMethod.java:304)", "usr.share.logstash.logstash\_minus\_core.lib.logstash.java\_pipeline.start\_workers(/usr/share/logstash/logstash-core/lib/logstash/java\_pipeline.rb:235)", "org.jruby.RubyProc.call(org/jruby/RubyProc.java:286)", "org.jruby.RubyProc.call(org/jruby/RubyProc.java:270)", "java.lang.Thread.run(java/lang/Thread.java:834)"]}
---
### Author:  [@Badger](https://discuss.elastic.co/u/Badger)
#### Post date: [April 27, 2019, 12:34pm UTC](https://discuss.elastic.co/t/invalid-fieldreference/178721/2 "2019-04-27T12:34:22Z")
Change "%{AccountName[0]}" to "%{[AccountName][0]}" throughout.
---
### Author:  [@Samvid\_Kulkarni](https://discuss.elastic.co/u/Samvid_Kulkarni)
#### Post date: [April 29, 2019, 7:14pm UTC](https://discuss.elastic.co/t/invalid-fieldreference/178721/3 "2019-04-29T19:14:17Z")
Hi
Thank you very much for your response and sorry for late response. Your solution worked perfectly. I am guessing the documentation is not updated for latest version.
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [May 27, 2019, 7:14pm UTC](https://discuss.elastic.co/t/invalid-fieldreference/178721/4 "2019-05-27T19:14:19Z")
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