This Bible contradiction is from the Skeptic's Annotated Bible.
They were frightened when they saw him.
Luke 24:37 View context
But they were terrified and affrighted, and supposed that they had seen a spirit.
They were gladdened.
John 20:20 View context
And when he had so said, he shewed unto them [his] hands and his side. Then were the disciples glad, when they saw the Lord.