 In April 2007, an official letter from the Public Transport Ticketing Corporation was sent to ERG Group expressing numerous concerns, such as software problems dogging the project.Beginning in August 2006, commuter field trials were held on selected lines of Sydney Buses and the Punchbowl Bus Company.The trials hit a hitch when bus drivers threatened a boycott due to the machine crashing when printing tickets, distracting drivers, which in turn led to safety issues.