I'm using symfony 2.3.15 and I have the bundle WhiteOctoberTCPDFBundle in the config.yml file I define the parameters as follows:

white_october_tcpdf:
tcpdf:
k_tcpdf_external_config: true
k_path_fonts: '%kernel.root_dir%/../vendor/tecnick.com/tcpdf/fonts/'

But somehow you lose the last character "/", so k_path_fonts constant has the value "real_path /.. / Vendor / tecnick.com / tcpdf / fonts" and this causes problems, because it lacks the last "/ ".

Not so with symfony 2.3.13.