# DYNAMIC_SERIES

A series is chosen in a way Forge cannot read before the run.

## What happened

Forge reads which series a strategy asks for before the run, so it can load only the data it needs. A series chosen in a way it cannot read, for example from a variable computed at run time, is refused.

## What to do

Write the price field, the symbol or the timeframe in the file, or use a setting.

## Example

```text
strategy.py, line 42: d[...] takes a price field or a symbol written in the file, or a setting. [DYNAMIC_SERIES]
```

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