DENVER (AP) -- Colorado's county election clerks are sounding alarms about possible voting problems next month,

The clerks sent a four-page letter of complaints Monday to Colorado's top elections officer, Republican Secretary of State Scott Gessler.

Among the fears expressed by the Colorado County Clerks Association, there was a complaint about new mobile registration applications. The clerks say those apps weren't properly tested and required emergency rules.

The clerks also took issue with a new policy for overseas voters. The clerks said that a print-your-own-ballot system for overseas voters was also improperly tested and has led to problems.

The clerks requested an in-person meeting with Gessler.