Console errors 412 Error

Console errors----:

VM362:2 POST desf/.../bulk 412

/sugarcrm/rest/v11_5/bulk:1 Failed to load resource: the server responded with a status of 412 ()


aabe7d66-b1ca-11e9-9d00-02a401d5b724:1

Failed to load resource: the server responded with a status of 412 ()
Cases:1

Failed to load resource: the server responded with a status of 412 ()