# Failed to build request: Value is null

**URL:** https://community.gatling.io/t/failed-to-build-request-value-is-null/5618
**Category:** Gatling (Open-Source)
**Created:** [May 12, 2020, 9:36pm UTC](https://community.gatling.io/t/failed-to-build-request-value-is-null/5618 "2020-05-12T21:36:52Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![Gabriel\_Valencia](https://avatars.discourse-cdn.com/v4/letter/g/2bfe46/32.png) [@Gabriel\_Valencia](https://community.gatling.io/u/Gabriel_Valencia)
#### Post date: [May 12, 2020, 9:36pm UTC](https://community.gatling.io/t/failed-to-build-request-value-is-null/5618/1 "2020-05-12T21:36:52Z")

</div>

Hi we are getting this when executing our simulation with the Maven plugin. Is there a way to get tracing of the requests to debug this? I can’t seem to find any way to do that with the plugin execution of Gatling.

`

\<gatling.version\>3.3.1\</gatling.version\>

\<gatling-plugin.version\>3.0.5\</gatling-plugin.version\>

`

---

<div class="post-metadata">

### Author: ![Gabriel\_Valencia](https://avatars.discourse-cdn.com/v4/letter/g/2bfe46/32.png) [@Gabriel\_Valencia](https://community.gatling.io/u/Gabriel_Valencia)
#### Post date: [May 12, 2020, 10:26pm UTC](https://community.gatling.io/t/failed-to-build-request-value-is-null/5618/2 "2020-05-12T22:26:40Z")

</div>

Found it! I added my own gatling-logback.xml alongside pom.xml and referenced it with

`

-Dlogback.configurationFile=gatling-logback.xml

`

For reference this is the logback I used:

`

\<?xml version="1.0" encoding="UTF-8"?\>

false

%d{HH:mm:ss.SSS} [%thread{10}][%-5level][%file:%line] %logger{15} - %msg%n%rEx

`