Linux String sed

Hi, Can anyone help me with why this task failed?

When I searched for the word string I cannot find it, but it still shows as failed?

Note : question said only remove String with Sonar. However your command will remove string as well. Which is incorrect. You have to replace with only String not string. Case sensitive matters.
Your command will be sed -i 's/String/Sonar/g' nautils.xml

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