I solved the problem. For those who have this problem, I am writing below. There is a problem with this topic on your page ( https://websitetoapk.com/docs/creating-keystore-for-signing.html )

You have a code like this on your page :

keytool -genkey -keyalg RSA -alias myalias -keystore newkeystore.keystore -storepass yourpassword -validity 36000 -keysize 2048

this is an incorrect code.

the correct code is as follows :

keytool -genkey -keyalg RSA -alias myalias -keystore newkeystore.jks -storepass yourpassword -validity 36000 -keysize 2048

Here is where you need to pay attention to in this code :
newkeystore.keystore

newkeystore.jks

When you create the keystore code in this way, you can install the application via the google play console.

Hello there;
I make all my settings on the W2APK application. I do the necessary operations in the Custom Keystore section from the Keystore & Signing section. It is signed without any problem. I press the Build App Bundle Button. The file is being downloaded. When I install via Google Play Console it gives the following error.
"Android App Bundle is not signed."

Hello;
When I click generate APK, then warning ESET NOD32 for virus (fakeapp.MJ)