[Can't start Tekkit]

Dear Devs,

I can't start Tekkit after installing it cause of this error:

 

[b#161] 2014/12/09 20:09:29 [WARNING] Unable to load platform pack tekkitmain
net.technicpack.rest.RestfulAPIException: Error accessing URL [http://beta.technicpack.net/api/modpack/tekkitmain]
    at net.technicpack.rest.RestObject.getRestObject(RestObject.java:108)
    at net.technicpack.platform.http.HttpPlatformApi.getPlatformPackInfo(HttpPlatformApi.java:54)
    at net.technicpack.platform.PlatformPackInfoRepository.getPlatformPackInfo(PlatformPackInfoRepository.java:60)
    at net.technicpack.platform.PlatformPackInfoRepository.getPackInfo(PlatformPackInfoRepository.java:48)
    at net.technicpack.launchercore.modpacks.PackLoadJob$6.run(PackLoadJob.java:195)
    at java.lang.Thread.run(Unknown Source)
Caused by: net.technicpack.rest.RestfulAPIException: Error in response: Pack does not exist
    at net.technicpack.rest.RestObject.getRestObject(RestObject.java:97)
    ... 5 more

 

I if anybody knows how to fix this please tell me.