Assertionerror: Expected False to Equal True

Here is the code:

this.Then(/^I click to the next button on the edit page$/,function(callback) {
    targetPO.getEditNextButton().isPresent().then(function(){
        targetPO.getEditNextButton().click().then(callback);
    });
})

I got the:

AssertionError: expected false to equal true

error. I can not find any useful tutorial, only saint tales.

What is the reason for the error?

Here is the getEditNextButton() function:

function getEditNextButton() {
    return element(by.id(selectors.editNextButton));
}