Pickle ImportError: No module named __builtin__

I'm trying to load a (copied) pickle object in python3.6 and I get an Import Error for __builtin__\r when I do so.

with open('FilePath/FileName.pkl', "rb") as file:
    file = pickle.load(file)

---------------------------------------------------------------------------
ModuleNotFoundError                       Traceback (most recent call last)
<ipython-input-36-b39fbab9bab4> in <module>()
      1 with open('FilePath/FileName.pkl', "rb") as file:
----> 2     file = pickle.load(file)

ModuleNotFoundError: No module named '__builtin__\r'

When I try the same in python 2.7, I get an Import Error again, for __builtin__ module:

---------------------------------------------------------------------------

ImportError                               Traceback (most recent call last)
<ipython-input-3-12ac6524bf1a> in <module>()
      1 with open('FilePath/FileName.pkl', "rb") as file:
----> 2     file = pickle.load(file)

/Users/manasa.bulusu/anaconda2/lib/python2.7/pickle.pyc in load(file)
   1382 
   1383 def load(file):
-> 1384     return Unpickler(file).load()
   1385 
   1386 def loads(str):

/Users/manasa.bulusu/anaconda2/lib/python2.7/pickle.pyc in load(self)
    862             while 1:
    863                 key = read(1)
--> 864                 dispatch[key](self)
    865         except _Stop, stopinst:
    866             return stopinst.value

/Users/manasa.bulusu/anaconda2/lib/python2.7/pickle.pyc in load_global(self)
   1094         module = self.readline()[:-1]
   1095         name = self.readline()[:-1]
-> 1096         klass = self.find_class(module, name)
   1097         self.append(klass)
   1098     dispatch[GLOBAL] = load_global

/Users/manasa.bulusu/anaconda2/lib/python2.7/pickle.pyc in find_class(self, module, name)
   1128     def find_class(self, module, name):
   1129         # Subclasses may override this
-> 1130         __import__(module)
   1131         mod = sys.modules[module]
   1132         klass = getattr(mod, name)

ImportError: No module named __builtin__

I imported builtins (py3.6) and __builtin__ (py2.7), but that didn't stop from throwing the exact same errors.
What is the actual problem here? Also, __builtin__\r doesn't even seem like a real package in py36.