2.1 (ReflectionException): Class ... does not exist

I my case,

enter image description here

I had actually a syntax error in the constructor. but it was not shown as usual errors with line number. I ran,

php bin/magento setup:di:compile

It displayed there is a syntax error and showed line number. Then updgrade,

php bin/magento setup:upgrade

and deploy,

php bin/magento setup:static-content:deploy

for developer mode,

php bin/magento setup:static-content:deploy -f

It may be helpful.

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