# BAD_BARS

The bars declaration is invalid.

## What happened

The `bars` declaration is not a bar declaration, uses a setting the class does not declare, or has values that cannot be resolved.

## What to do

Write `bars` as a declaration such as `fg.bars.Time("H1")`, and declare any setting it uses on the class first.

## Example

```text
strategy.py, line 14: The bars use a setting that is not declared on the class. Declare it first, like box = param.Float(10, min=5, max=30), then write bars = fg.bars.Renko(box). [BAD_BARS]
```

The wording of the message depends on your file, and the code does not. An error stops the file from loading.