The Blues continue to struggle to find their best form after a promising start to their season.
But they now find themselves five points adrift of the National League North play-off places and Johnson isn't happy.
"It's inexcusable," he told Cheshire Live. "We lack a lot of things. When you have done what we did in the first half of the season you should be pushing on now but actually it is the opposite.
"We've gone through the injury malarkey and all them type of reasons and what it could have been, but that isn't there anymore. There is none of that.
"We get paid to find answers to what has gone wrong and we've got to do that. We've got lots of questions to answer.
"We want to get to the play-offs, that's our goal but it is short term. Hopefully we'll get to the play-offs and a large group of that will be part of next year, but we're nowhere near.
"The group looks mentally weak, fragile and lacks leadership."