I tried the above solutions. But it didn't help me. Despite, I used the same commands which they mentioned with the changes of sequence. They are,

1. clear cache, composer_home, generation, log, page_cache, tmp and view_preprocessed from var directory

2. run the following commands one by one.

php bin/magento indexer:reindex

php bin/magento c:f

php bin/magento setup:static-content:deploy

I hope this may help to someone like me.

I tried the above solutions. But it didn't help me. Despite, I used the same commands which they mentioned with the changes of sequence. They are,

1. clear cache, composer_home, generation, log, page_cache, tmp and view_preprocessed from var directory

2. run the following commands one by one.

php bin/magento indexer:reindex

php bin/magento cache:flush

php bin/magento setup:static-content:deploy

I hope this may help to someone like me.