error loading the most common problems table

When filtering on 13.04 on errors.ubuntu.com an error occurs loading the most common problems table. Checking this via the api, https://errors.ubuntu.com/api/1.0/most-common-problems/?limit=0&release=Ubuntu%2013.04&format=json, produces the follwoing error:

{
  "error_message": "Sorry, this request could not be processed. Please try again later."
}

Testing the javascript that runs the API query (https://errors.ubuntu.com/api/1.0/most-common-problems/?limit=100&release=Ubuntu%2012.10&period=day&callback=YUI.Env.DataSource.callbacks.yui_3_5_0_3_1354703350440_3040) reveals a similar error:

YUI.Env.DataSource.callbacks.yui_3_5_0_3_1354703350440_3040({
  "error_message": "Sorry, this request could not be processed. Please try again later."
})

Unfortunately the oops-local files for this have no data and testing it in the development cloud does not produce the same error perhaps due to a lack of data.