急！网上怎么报不了名了？

如题，前几天和今天都试了，想报12月份考，但每次进行到look for available date and time 就出来说：

The GMAT registration system is unable to process your request at this time. Please return in a few hours and try again or make your appointment by phone. To schedule your test appointment by phone in the U.S, U.S. Territories, Puerto Rico, or Canada:

• call 1-800-GMAT-NOW (1-800-462-8669)
  
• call the test center directly (see Test Center List) or
  
• call 1-800-529-3590, if using TTY

大家有碰到这个情况吗？