freezing channels, but still can't add autotune

I have 300 tracks, I put autotune in 200 tracks but i need o put autotune in the other 100 track, but autotune says “out put memory, insufficient memory”, then I have freeze the 200 tracks that already have autotune, in order to then be able to add the autotune in the other 100 tracks and in this way, put autotune in all the 300 tracks, and finally each one of the 300 track with autotube be freezed.

What happens is that: I freeze the 200 tracks that already have autotune, then I try to add more autotune in the others 100 tracks but i still receive the message of “out put memory - insuficient memory”
why I have still receiving the output memory error if I have already freezealmost of the tracks?

using windows 10, 64 bits, 16GB ram, cubase 5 in 32 bits and autotune in 32 bits. any advice please?