If your campaign has errored, no spend will start and the campaign will not be charged. It needs to be cloned, fixed and published.
There's a little 'i' icon next the error message which will display the error when hovering over it
In this instance, it is relevant to the "objective" that was selected. If you go across next to the error message there is a set of three buttons. The first one is "clone".
If you clone the post, it is going to mirror the campaign without setting it live. Once cloned, click on the pencil button to edit the campaign to "finish editing". This is where you can revise the error.
Revise the details of the campaign and click through the next steps.
It will bring you to the summary page. Once satisfied, click publish campaign.