What does it mean there's more than one way to cross a bridge

It probably means there's more than one way to solve a problem.
A bridge is a problem right? An obstacle you have to cross to reach your destination.
So it's saying there's more than way to bypass the obstacle to reach your goal; there's more than one way to do things.

It means there us more than one way to gwt to the other side or solve the problem

The error in the sentence is a dangling modifier