When I reconnect Motion clips in Final Cut Pro, it shows me the following error message. What does this mean?

This error message will be displayed if a version has been assigned a new template which has a different duration to the original template used.

For example, if the original template was 5 seconds long and the new template is only 3 seconds long then the Motion clip will be reduced to 3 seconds duration in the sequence but will still start on the same frame. Simply click the Continue button and Final Cut Pro will adjust the duration of the Motion clip in the sequence automatically.