'Till now no one has been able to prove that spiritual powers do not exist. Therefore, it is proved that spiritual powers do exist.' Identify the flaw in the above argument.

The flaw is an appeal to ignorance.

The only ground offered is that no one has disproved spiritual powers.

Failure to disprove a claim is treated as proof that it is true.

Lack of evidence against something is not evidence for it.

A claim's truth must rest on positive support, not on its merely unrefuted status.

Treating 'not disproved' as 'proved' is the argumentum ad ignorantiam.