Dependency error while installing app on heroku - python-2.7

Question

I am trying to install app on heroku. After doing git push heroku master, I am getting following error.
-----> Installing dependencies using Pip (1.5.4)
Exception:
Traceback (most recent call last):
File "/app/.heroku/python/lib/python2.7/site-packages/pip-1.5.4-py2.7.egg
/pip/basecommand.py", line 122, in main
status = self.run(options, args)
File "/app/.heroku/python/lib/python2.7/site-packages/pip-1.5.4-py2.7.egg /pip/commands/install.py", line 262, in run
for req in parse_requirements(filename, finder=finder, options=options, session=session):
File "/app/.heroku/python/lib/python2.7/site-packages/pip-1.5.4-py2.7.egg/pip/req.py", line 1631, in parse_requirements
req = InstallRequirement.from_line(line, comes_from, prereleases=getattr(options, "pre", None))
File "/app/.heroku/python/lib/python2.7/site-packages/pip-1.5.4-py2.7.egg/pip/req.py", line 172, in from_line
return cls(req, comes_from, url=url, prereleases=prereleases)
File "/app/.heroku/python/lib/python2.7/site-packages/pip-1.5.4-py2.7.egg/pip/req.py", line 70, in __init__
req = pkg_resources.Requirement.parse(req)
File "/app/.heroku/python/lib/python2.7/site-packages/pip-1.5.4-py2.7.egg/pip/_vendor/pkg_resources.py", line 2606, in parse
reqs = list(parse_requirements(s))
File "/app/.heroku/python/lib/python2.7/site-packages/pip-1.5.4-py2.7.egg/pip/_vendor/pkg_resources.py", line 2544, in parse_requirements
line, p, specs = scan_list(VERSION,LINE_END,line,p,(1,2),"version spec")
File "/app/.heroku/python/lib/python2.7/site-packages/pip-1.5.4-py2.7.egg/pip/_vendor/pkg_resources.py", line 2512, in scan_list
raise ValueError("Expected "+item_name+" in",line,"at",line[p:])
ValueError: ('Expected version spec in', 'Usage:', 'at', ':')
Storing debug log for failure in /app/.pip/pip.log
I am not sure what is missing. I am adding my requirements.txt which looks like.
Babel==1.3
Flask==0.9
Flask-Babel==0.8
Flask-Login==0.2.10
Flask-Mail==0.7.6
Flask-OpenID==1.2.1
Flask-SQLAlchemy==0.16
Flask-WTF==0.8.4
Flask-WhooshAlchemy==0.55a
Jinja2==2.7.2
MarkupSafe==0.19
SQLAlchemy==0.7.9
Tempita==0.5.2
WTForms==1.0.5
Werkzeug==0.9.4
Whoosh==2.6.0
argparse==1.2.1
blinker==1.3
decorator==3.4.0
flup==1.0.2
gunicorn==18.0
python-openid==2.2.5
pytz==2013b
speaklater==1.3
sqlalchemy-migrate==0.7.2
wsgiref==0.1.2
Not sure if its version issue.