The apostles were responsible for producing the bulk of the New Testament Scriptures, and in this ministry they were carried along by the Holy Spirit in such a way that their writings were God-breathed. But this does not mean that the apostles themselves, by virtue of their office or gift, were incapable of making mistakes.
The promotion of miraculous gifts and revelatory experiences such as visions and dreams, attacks and undermines the sufficiency of Scripture.
The first argument in favor of the continuation of miraculous gifts is that the New Testament never plainly states that the gifts would cease during the church age. If one gift has come to an end without a direct statement that it would, then there is no reason to think that the others cannot also have ceased sometime after the founding of the church.