Can't run subprocess on AWS EC2

We have an ec2 instance running with django rest framework. Now, there I want to be able to run a crontab that initiates a python script that calls a php script.

test.py

class Command(BaseCommand):
    def handle(self, *args, **options):
        p = subprocess.Popen(['php', "/opt/python/current/app/my-app/my_test_file.php", name, caption], stdout=subprocess.PIPE)
        result = p.communicate()[0]

Now on my local machine I get no errors whatsoever. It works fine. And as you can see I use an absolute path there.

When uploading to ec2 and running I get this error:

>       File "/usr/lib64/python2.7/subprocess.py", line 522, in call
>         return Popen(*popenargs, **kwargs).wait()
>       File "/usr/lib64/python2.7/subprocess.py", line 710, in __init__
>         errread, errwrite)
>       File "/usr/lib64/python2.7/subprocess.py", line 1335, in _execute_child
>         raise child_exception
>     OSError: [Errno 2] No such file or directory

What does this have to do with? Is it because of a php file that it can't find? Because I also used this method as well:

directory = os.getcwd()
p = subprocess.Popen(['php', directory + "/my_test_file.php", name, caption], stdout=subprocess.PIPE)

And that worked locally but again on ec2 gave that same error!

Please help! Thank You in advance!