Please help me how can I solve this problem?? I use Android Studio Iguana

Directory 'C:\Users\������\.gradle' does not contain a Gradle build.

That is your gradle user home. It indeed should not contain a Gradle build. But hard to say from just that line what you did do to get this.

I have this error too. What information do you need to resolve my error?

That means that you told AS to use the Gradle version defined in your wrapper files. Each Gradle build should contain the 4 Gradle wrapper files, or imho it has a build bug. I guess you told AS to open

~/.gradle

as a project which then causes both your issues, as that directory correctly is not a Gradle build and thus also does not have the Gradle wrapper files.

What settings should I modify and where? Please help me...

I cannot, I have no idea what you did. As I said, I guess you opened

~/.gradle

as project which you should not do.

Should I modify something in here??

Go to the Gradle tool window and there remove the wrongly added project

Where can I find Gradle tool window?

I have no idea where you put it, or where AS puts it by default. If in doubt, use Ctrl+Shift+a and type "Gradle" into the appearing search box

Ok thank you...