AtributeError: 'Str' has no object attribute '_meta'

Thousands of times try to solve out this issue but failed. Kindly anyone help me to get rid from issue. I hope mosh sir will give some light on this issue. 'cause as a beginner need something direct solution when we needed. For finding solutions sometimes spend the whole day for single issuue. Kindly @mosh_sir kindly help us here.