AFL general counsel Andrew Dillon said that the club had advised the AFL of its decision to conduct an overseas training camp.
But "due to an administrative error" it had failed to notify ASADA at the same time that 12 players would be at the training camp in Colorado between November 5-19.
Under the AFL's anti-doping code, all clubs are required to keep ASADA notified at all times of the location of listed players for possible drug testing 365 days a year.
"The club has a strong history of compliance with all the paperwork requirements of the anti-doping code to ensure that ASADA is fully informed at all times and can perform its duties," said Dillon.
"In this instance, while the AFL had been notified of the club's activities, ASADA was not separately notified.
"While this was an administrative error, it is important that the rules are fully complied with."
The AFL imposed a $10,000 fine on the club but $5000 of it was suspended until December 31, 2015.