could anyone help me to solve this problem

Please never anywhere share screenshots (or worse photos) of text if you only want to share the text and not something additional like colors or IDE annotations. Text in images is hard to read, especially on mobile, very hard to copy, and nearly impossible to search for. Besides that, your screenshot says AGP 7.4.2 was not found and it was searched in "Google" among others where it is available. So either this was a temporary quirk and you can probably resolve it by using

--refresh-dependencies

to make sure Gradle is not remembering it couldn't resolve it, or if not then it most often is the case that you need to use some Proxy to access the internet but did not have configured this for Gradle and so you are getting some false results. You might be able to get more information about the requests done and responses received when also adding

--info

or

--debug

additionally.