Failed Launching URL

[rattler45]

Ive been running Ro with no problems whatsoever up until today. started up steam, clicked on RO and as i went to join a server, i got the following message:
Failed Launching URL
Package 'allies_ahz_45mm_anm' version mismatch.

can anyone tell me what that means and how i can fix it.


OS
Windows 7 Home Premium
64 bit
AMD PhenomII x4 3.40 GHz
4 GB RAM
NVIDIA GEFORCE 9500GT 1GB

 

[Zetsumei]

You got a file in your RO cache folder that conflicts with the file on the server.
The easiest fix is closing RO and then joining the server again as it should then overwrite.

Or going to the cache folder locating the text file. Look what weird string of text is equals to the file that is conflicting. Then locate that file in the cache folder and delete it.