S2.exp - method not written yet

I'm calling queryRadius like this:

manager.queryRadius({
  RadiusInMeter: 10000,
  CenterPoint: {
    latitude: 55.1418401, 
    longitude: -4.110009499999933
  }})

And I'm seeing this exception:

2017-11-21T18:52:14.192Z    15d68269-ceed-11e7-9d2c-afc530895a1c    Unhandled rejection Error: method not written yet
at Function.S2.exp (/var/task/node_modules/nodes2ts/dist/S2.js:51:15)
at S2Metric.getMaxLevel (/var/task/node_modules/nodes2ts/dist/S2Metric.js:67:32)
at S2RegionCoverer.getInitialCandidates (/var/task/node_modules/nodes2ts/dist/S2RegionCoverer.js:321:87)
at S2RegionCoverer.getCoveringInternal (/var/task/node_modules/nodes2ts/dist/S2RegionCoverer.js:366:14)
at S2RegionCoverer.getCoveringUnion (/var/task/node_modules/nodes2ts/dist/S2RegionCoverer.js:181:14)
at S2RegionCoverer.getCoveringCells (/var/task/node_modules/nodes2ts/dist/S2RegionCoverer.js:156:24)
at GeoDataManager.queryRadius (/var/task/node_modules/dynamodb-geo/dist/GeoDataManager.js:205:82)
at Object.queryRadius (/var/task/dist/lib/storage/dynamodb/geo.js:65:20)
at Object.queryRadius [as radius] (/var/task/dist/readmodels/geocoded.js:62:34)
at query (/var/task/dist/readmodels/geocoded.js:76:53)
at /var/task/dist/readmodels/geocoded.js:91:31
at next (native)
at step (/var/task/dist/readmodels/geocoded.js:3:191)
at /var/task/dist/readmodels/geocoded.js:3:437
at Promise._execute (/var/task/node_modules/bluebird/js/release/debuggability.js:303:9)
at Promise._resolveFromExecutor (/var/task/node_modules/bluebird/js/release/promise.js:483:18)

I had a look at the function in question, but I can't tell why it reaches the point where this exception is thrown. It is also unclear to me why this happens with the parameters in question, or whether it depends on the data in my database? Any ideas?

robhogan / dynamodb-geo.js

S2.exp - method not written yet #11