[MapProxy] bulk_meta_tiles error

[Travis Kirstine]

I'm getting a error:

TypeError: store_tiles() missing 1 required positional argument:
'dimensions'

When trying to use the bulk_meta_tiles option for my cache with a WMTS tile
source.

Any ideas - config below

# Yaml
caches:
   swoop_2015_cache:
      grids: [merc_grid]
      sources: [swoop_2015_wmts]
      meta_size: [2,2]
      bulk_meta_tiles: true
      concurrent_tile_creators: 4
      cache:
         type: sqlite
         directory: /home/share1/cache

sources:
   swoop_2015_wmts:
      type: tile
      url: '
https://tiles.arcgis.com/tiles/TJH5KDher0W13Kgo/arcgis/rest/services/SWOOP_2015_TPK/MapServer/WMTS/tile/1.0.0/SWOOP_2015_TPK/default/default028mm/%(z)s/%(y)s/%(x)s
'
      grid: merc_grid
      transparent: true
      on_error:
         404:
            response: transparent
            cache: false
      coverage:
          bbox: [-83.23718055985752, 41.674296689096344,
-78.86342333976725, 45.58466983773021]
          srs: 'EPSG:4326'
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