tar: Error is not recoverable: exiting now

I would try to unzip and untar separately and see what happens:

mv Doctrine-1.2.0.tgz Doctrine-1.2.0.tar.gzgunzip Doctrine-1.2.0.tar.gztar xf Doctrine-1.2.0.tar

Try to get your archive using wget, I had the same issue when I was downloading archive through browser. Than I just copy archive link and in terminal use the command:

wget http://PATH_TO_ARCHIVE

The problem is that you do not have bzip2 installed. The tar program relies upon this external program to do compression.For installing bzip2, it depends on the system you are using. For example, with Ubuntu that would be on Ubuntu

sudo apt-get install bzip2

The GNU tar program does not know how to compress an existing file such as user-logs.tar (bzip2 does that). The tar program can use external compression programs gzip, bzip2, xz by opening a pipe to those programs, sending a tar archive via the pipe to the compression utility, which compresses the data which it reads from tar and writes the result to the filename which the tar program specifies.

Alternatively, the tar and compression utility could be the same program. BSD tar does its compression using lib archive (they're not really distinct except in name).