Is this a wrong-server-version error?

[Criel 0]

I just downloaded the tekkit server and have been trying to connect to it.  I'm able to start a vanilla server just fine but when I try to do the same on tekkit I have been getting many errors.

 

Bad packet errors, connection aborted, protocol errors.

 

I am running server 1.6.4, is this the correct version to go with tekkit?

[AetherPirate 93]

Tekkit Legends is 1.7.10. Did you download Legends, or Tekkit Main (rocketship), or Classic? 

The client you are connecting to your Tekkit Legends server needs be running the same version of the modpack.