Error 'pdfinfo' about pdf2image HOT 4 CLOSED

FileNotFoundError                         Traceback (most recent call last)
<ipython-input-8-1e5630119050> in <module>()
----> 1 images = convert_from_bytes(open('./testimage.pdf', 'rb').read())

/usr/local/Cellar/python3/3.6.0/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/pdf2image/pdf2image.py in convert_from_bytes(pdf_file, dpi, output_folder, first_page, last_page, fmt, thread_count, userpw)
     88         f.write(pdf_file)
     89         f.flush()
---> 90         return convert_from_path(f.name, dpi=dpi, output_folder=output_folder, first_page=first_page, last_page=last_page, fmt=fmt, thread_count=thread_count, userpw=userpw)
     91 
     92 def __build_command(args, output_folder, first_page, last_page, fmt, uid, userpw):

/usr/local/Cellar/python3/3.6.0/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/pdf2image/pdf2image.py in convert_from_path(pdf_path, dpi, output_folder, first_page, last_page, fmt, thread_count, userpw)
     27     """
     28 
---> 29     page_count = __page_count(pdf_path, userpw)
     30 
     31     if thread_count < 1:

/usr/local/Cellar/python3/3.6.0/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/pdf2image/pdf2image.py in __page_count(pdf_path, userpw)
    156         proc = Popen(["pdfinfo", pdf_path, '-upw', userpw], stdout=PIPE, stderr=PIPE)
    157     else:
--> 158         proc = Popen(["pdfinfo", pdf_path], stdout=PIPE, stderr=PIPE)
    159 
    160     out, _ = proc.communicate()

/usr/local/Cellar/python3/3.6.0/Frameworks/Python.framework/Versions/3.6/lib/python3.6/subprocess.py in __init__(self, args, bufsize, executable, stdin, stdout, stderr, preexec_fn, close_fds, shell, cwd, env, universal_newlines, startupinfo, creationflags, restore_signals, start_new_session, pass_fds, encoding, errors)
    705                                 c2pread, c2pwrite,
    706                                 errread, errwrite,
--> 707                                 restore_signals, start_new_session)
    708         except:
    709             # Cleanup if the child failed starting.

/usr/local/Cellar/python3/3.6.0/Frameworks/Python.framework/Versions/3.6/lib/python3.6/subprocess.py in _execute_child(self, args, executable, preexec_fn, close_fds, pass_fds, cwd, env, startupinfo, creationflags, shell, p2cread, p2cwrite, c2pread, c2pwrite, errread, errwrite, restore_signals, start_new_session)
   1324                             else:
   1325                                 err_msg += ': ' + repr(orig_executable)
-> 1326                     raise child_exception_type(errno_num, err_msg)
   1327                 raise child_exception_type(err_msg)
   1328 

FileNotFoundError: [Errno 2] No such file or directory: 'pdfinfo'