Change Import Error Message

[deependujha]

What does this PR do?

Fixes #<issue_number>

credits: pr #21369

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📚 Documentation preview 📚: https://pytorch-lightning--21370.org.readthedocs.build/en/21370/

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89%. Comparing base (e98df3c) to head (3a32eff).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #21370   +/-   ##
=======================================
  Coverage      89%      89%           
=======================================
  Files         269      269           
  Lines       22050    22050           
=======================================
  Hits        19724    19724           
  Misses       2326     2326           

[deependujha]

weird irrelevant errors, but looking into them.