yii2 and Bad Request (#400) with Missing required parameters: ID

Using Yii 2 is really easy, but for a newbie sometimes the Gii (i.e. the code generator helper tool) may generate a code, which only the index page works and the other pages like view, update generates a strange error of missing ID (note it is capitalized ID):

Bad Request (#400)
Missing required parameters: ID

The above error occurred while the Web server was processing your request.

Please contact us if you think this is a server error. Thank you.

SCREENSHOT 1) Just viewing an item generates the error of a bad request.

main menu
view with id

Here is the tracing log:

error	yii\web\HttpException:400	yii\web\BadRequestHttpException: Missing required parameters: ID in /home/myuser/projects/test-web/vendor/yiisoft/yii2/web/Controller.php:202
Stack trace:
#0 /home/myuser/projects/test-web/vendor/yiisoft/yii2/base/InlineAction.php(51): yii\web\Controller->bindActionParams()
#1 /home/myuser/projects/test-web/vendor/yiisoft/yii2/base/Controller.php(178): yii\base\InlineAction->runWithParams()
#2 /home/myuser/projects/test-web/vendor/yiisoft/yii2/base/Module.php(552): yii\base\Controller->runAction()
#3 /home/myuser/projects/test-web/vendor/yiisoft/yii2/web/Application.php(103): yii\base\Module->runAction()
#4 /home/myuser/projects/test-web/vendor/yiisoft/yii2/base/Application.php(384): yii\web\Application->handleRequest()
#5 /home/myuser/projects/test-web/web/index.php(12): yii\base\Application->run()
#6 {main}

Probably, the problem is in the Controller class of the route you are trying to view. For example, the above URL is http://localhost:8888/odd-type/view?id=1 the route is /odd-type/view and apparently, the OddTypeController class may not find the ID parameter.
SCREENSHOT 2) The function actionView has the parameter $ID, which is used in the function findModel($ID).

main menu
actionView with capitalized ID

Keep on reading!