---
title: Troubleshooting
slug: ps/help/en_us/vtm/tsg/troubleshooting
docTags: 
createdAt: 2026-08-02T09:41:21.312Z
---

Writing and debugging complex TrafficScript rules is an involved process. This chapter lists some useful techniques.

## Checking Syntax

A syntax error occurs if you make an error in your TrafficScript rule that prevents the Traffic Manager from fully understanding the rule.

When editing a rule in the Admin UI, you can check the syntax at any time using the Check Syntax button on the **Catalogs > Rules > Edit** page.

You can also check the syntax of a TrafficScript rule from the command line using the zeus.zxtm binary as follows:

```bash
$ export ZEUSHOME=/usr/local/zeus
$ $ZEUSHOME/zxtm/bin/zeus.zxtm --rulesyntaxcheck rulefile
Compilation failed, with 1 error
Error: line 20: Wrong number of arguments to function pool.use

pool.use( );
^
```

TrafficScript is not case-sensitive. Function names and variables can be referred to using any combination of case.