-[[playground:playground:matt:Receive_Payments|]]
  -[[playground:playground:matt:Change_Bills|]]
  -[[playground:playground:matt:Ledger_Menu|]]
  -[[playground:playground:matt:Reports|]]
  -[[playground:playground:matt:Bills_And_Dups|]]
  -[[playground:playground:matt:Import_Menu|]]
  -[[playground:playground:matt:Settings|]]
  -[[playground:playground:matt:Utilities|]]

A book exported as a PDF:
{{ :playground:playground:sample_book.pdf |}}

When tried on the PlayGround pages, why does this happen?
{{:playground:playground:error.png?200|}}