Please, I applied for visa for my child (under 18) with a court affidavit but they sent a mail requesting for court order of sole responsibility. Please how do I go about this because the father in question has been absent from our lives.

Hi everyone, please can I travel on student visa with my child alone without the father?(because we are separated) though he has given his consent and signed an affidavit for guardianship and parental consent. If the document enough or I need any other document. Please, I need help urgently.