Matthew 22:29

You err not knowing the scriptures and the power of God.

So here a person goes into error when they are oblivious of 2 things:

 what the scripture says

 The power of God

This is Jesus’ response to those who were asking him if there would be marriages when we get to heaven. They painted a picture of a woman who got married to 6 men (brothers) and asked who her true husband would be in the resurrection.

The people asking these questions were religious - those who claim to have a handle on God - but they missed it - Jesus says they may be religious but they have gone into error.