A borderRadius can only be given for uniform borders

Question

I am getting a warning when using following code but my app is running fine:

════════ Exception caught by rendering library ═════════════════════════════════════════════════════
The following assertion was thrown during paint():
A borderRadius can only be given for uniform borders.
'package:flutter/src/painting/box_border.dart':
Failed assertion: line 510 pos 12: 'borderRadius == null'

Here is my code:

           Container(
              height: screenSize.height*.13,
              width: AppSize.medium,
              decoration: BoxDecoration(
                color: Colors.red,
                border: Border(
                  right: BorderSide(
                    width: 1.0,
                    color: Colors.blue
                  ),
                ),
                borderRadius: BorderRadius.only(
                  topRight: Radius.circular(AppSize.small),
                  bottomRight: Radius.circular(AppSize.small),
                )
              ),
            )

Answer 1

This is the easiest way that I could came up with... as you can see there's 2 container, the color of outer container is actually the color of the border and the margin of inner container is the strokeWidth of the border and the color of inner container is the background color.

Container(
  decoration: BoxDecoration(
    color: Colors.grey[400],

    borderRadius: BorderRadius.only(
      topLeft: const Radius.circular(15.0),
      topRight: const Radius.circular(15.0),
    ),// BorderRadius

  ),// BoxDecoration
  child: Container(
    margin: const EdgeInsetsDirectional.only(start: 2, end: 2, top: 2),
    decoration: BoxDecoration(
      color: Colors.grey[300],

      borderRadius: BorderRadius.only(
        topLeft: const Radius.circular(13.0),
        topRight: const Radius.circular(13.0),
      ),// BorderRadius

    ),// BoxDecoration
  ),// Container
),// Container

It's a bit silly answer but works! ;)