I have just installed fedora 29 and all goes well. however, when I try to use DNF to install or search applications, I am getting the following error message. Please, help me how I can get this resolved.

edit

Error processing line 1 of /usr/lib/python3.7/site-packages/Paste-2.0.3-py3.7-nspkg.pth:

Fatal Python error: initsite: Failed to import the site module
Traceback (most recent call last):
  File "/usr/lib64/python3.7/site.py", line 168, in addpackage
    exec(line)
  File "<string>", line 1, in <module>
  File "/usr/lib64/python3.7/importlib/util.py", line 14, in <module>
    from contextlib import contextmanager
  File "/usr/lib64/python3.7/contextlib.py", line 5, in <module>
    from collections import deque
  File "/usr/lib64/python3.7/collections/__init__.py", line 22, in <module>
    from keyword import iskeyword as _iskeyword
  File "<frozen importlib._bootstrap>", line 983, in _find_and_load
  File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 677, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 724, in exec_module
  File "<frozen importlib._bootstrap_external>", line 857, in get_code
  File "<frozen importlib._bootstrap_external>", line 525, in _compile_bytecode
ValueError: bad marshal data (unknown type code)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib64/python3.7/site.py", line 581, in <module>
    main()
  File "/usr/lib64/python3.7/site.py", line 568, in main
    known_paths = addsitepackages(known_paths)
  File "/usr/lib64/python3.7/site.py", line 360, in addsitepackages
    addsitedir(sitedir, known_paths)
  File "/usr/lib64/python3.7/site.py", line 207, in addsitedir
    addpackage(sitedir, name, known_paths)
  File "/usr/lib64/python3.7/site.py", line 178, in addpackage
    import traceback
  File "/usr/lib64/python3.7/traceback.py", line 3, in <module>
    import collections
  File "/usr/lib64/python3.7/collections/__init__.py", line 22, in <module>
    from keyword import iskeyword as _iskeyword
  File "<frozen importlib._bootstrap>", line 983, in _find_and_load
  File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 677, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 724, in exec_module
  File "<frozen importlib._bootstrap_external>", line 857, in get_code
  File "<frozen importlib._bootstrap_external>", line 525, in _compile_bytecode
ValueError: bad marshal data (unknown type code)