Corrupt on install?

[scaddenp]

Not having any luck install this on Redhat linux,

Fetching: pdf-extract-0.1.1.gem (100%)
ERROR: Error installing pdf-extract:
invalid gem: package is corrupt, exception while verifying: undefined method `path2class' for #Psych::ClassLoader:0x000000020233a0 (NoMethodError) in /home/scaddenp/.gem/ruby/cache/pdf-extract-0.1.1.gem

ruby -v
ruby 2.0.0p598 (2014-11-13) [x86_64-linux]

gem list
afm (0.2.2)
Ascii85 (1.0.2)
bigdecimal (1.2.7, 1.2.0)
commander (4.4.0)
hashery (2.1.2)
highline (1.7.8)
io-console (0.4.6, 0.4.2)
json (2.0.2, 1.7.7)
libsvm-ruby-swig (0.4.0)
mini_portile2 (2.1.0)
nokogiri (1.6.8)
pdf-core (0.6.1)
pdf-extract (0.1.1)
pdf-reader (1.4.0)
pkg-config (1.1.7)
prawn (2.1.0)
psych (2.1.0, 2.0.0)
rdoc (4.2.2, 4.0.0)
ruby-rc4 (0.1.5)
rubygems-update (2.6.6)
sqlite3 (1.3.11)
ttfunk (1.4.0)