Charts not generating

[rstudley]

(Another issue probably to deal with after the migration...)

I ran 13 test jobs last night. Of the 12 that have completed so far, 4 had one or more charts that didn't get generated. The attached PDF shows a job that had four such cases:

OUTCOME: Algebra I: High school end-of-course exam, 2013
Participant outcomes typically fell below outcomes of matched counterparts
There was an error generating this chart.

OUTCOME: English II: High school end-of-course exam, 2013
Participant outcomes typically fell below outcomes of matched counterparts
There was an error generating this chart.

OUTCOME: Promotion, Current Year, 2012
Participant outcomes typically fell below outcomes of matched counterparts
There was an error generating this chart.

OUTCOME: Promotion, Current Year, 2013
Participant outcomes typically fell below outcomes of matched counterparts
There was an error generating this chart.

Here's the PDF:
EE Report280.pdf

The full testing record is here:
https://docs.google.com/spreadsheets/d/1hvtGxw9KcJFS2cvKz647qtNQoj9mEt8JrLC1L_x3BCc/edit?pli=1#gid=1860647269