Unknown source in bundle

[ThibaultNocchi]

Hello everyone,

I'm trying floweaver for the first time and encountering problems when making my first graph.
Here is the data:

I'm simply trying at first to display a single flow from "rev1" to "rev2" with this code:

import floweaver

nodes = {
    'start': floweaver.ProcessGroup(['rev1']),
    'end': floweaver.ProcessGroup(['rev2'])
},

ordering = [
    ['start'],
    ['end']
]

bundles = [
    floweaver.Bundle('start', 'end')
]

sdd = floweaver.SankeyDefinition(nodes, bundles, ordering)
floweaver.weave(sdd, global_df)

But when initializing SankeyDefinition, I get a ValueError exception: "Unknown source "start" in bundle 0"

What am I doing wrong?

Thanks in advance

EDIT: I am using floweaver 2.0.0a6 from Pypi.
EDI2: Well I'm a stupid twat. I put a comma after my "nodes" declaration. Have a nice day haha.