Attempt to invoke virtual method 'java.lang.String'

Attempt to invoke virtual method ‘java.lang.String’ on a null object reference

google ad Manager
I get an error like this when I add
I gave the page name

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Did you find a solution, please help…

I’m sorry for the late reply

codes i don’t know how to get the page name
can you recommend a guide for getting ads and google ad manager or block code
I didn’t quite understand how to do it
How should the page name be?
what should i write

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