# ClassNotFoundException - GroovyStarter

```
Error: Could not find or load main class org.codehaus.groovy.tools.GroovyStarter
Caused by: java.lang.ClassNotFoundException: org.codehaus.groovy.tools.GroovyStarter
```

<figure><img src="/files/hOFBuf4gCZVF7fSV2n30" alt=""><figcaption><p>ClassNotFoundException - GroovyStarter</p></figcaption></figure>

This error message appears when you try to run a process- or map-script directly.&#x20;

<figure><img src="/files/6GA6mlJgbzVW9EDaBPnP" alt=""><figcaption></figcaption></figure>

You must start the `Test_` (as the script host), not the script itself -> [Concepts](/boomi-scriptease/general.md)


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