T446

A window field must hold a chart, heatmap, or table panel. To put a pane in a window, declare a chart panel in the field and attach the pane with on: w.main.

Failing example

script "conf"
window w = window() { main: pane() }

Corrected example

script "fixed"
window w = window() { main: chart.panel() }
pane p = pane(on: w.main)