Short Parliament
The problem was that the members of Parliament were unhappy about the things he had done since 1629, when he was ruling without them.  They wanted to talk about these things instead of giving the king his money.  John Pym, member for Tavistock, gave fiery speeches refusing to give money unless the abuses were talked about. Charles responded by closing the Parliament and sending them home again, and he tried to fight the Scots without the money.  But when this did not work and as a result of his defeat had to agree to pay the Scots, he was forced to call Parliament again.  This became known as the Long Parliament, and the Constitutional crisis that followed led to the bloody English Civil War.