In doing:
from rtdsllc import app as application
it will be importing:
rtdsllc/rtdsllc/__init__.py
According to your directory listing:
0 -rw-r--r--. 1 apache apache 0 Apr 25 20:57 __init__.py
that file is empty and has not 'app' object in it to drag in via the import.
Which file is the following in?
app = Flask(__name__)
Right now it isn't in the place that you are trying to import it from.
UPDATE 1
Use:
from rtdsllc.routes import app as application
if you 'app' object is in 'rtdsllc.routes'.