Unable to Fillet edge

[GD1224]

Hi, I have been designing a custom face plate to go over a monitor to fit into my car. All is going well with the design however on one side i am unable to fillet an edge. As i was able to do it on the other side i have no idea what the problem is! I will attach the file and a picture of the edge if anyone has any ideas or could help me out. Would be greatly appreciated.

Regards, Josh

[Patchy]

The error is here, I don't know how it was drawn.

 

[GD1224]

That's weird!, It docent show that for me, do you know how to fix it?

[Patchy · Accepted solution]

Try this, I drew the green one with radius of 3 for testing.

You can use the red one with your radius.

 

[GD1224]

Legend! Thank you very much, how were you able to do this? Also how do I remove the Red colour? 

Kind Regards

[Patchy · Accepted solution]

I sliced off the stubborn section and reworked the region, extruded it back and unioned them; after that fillet worked.

Window across them, go to Properties and change the color.

[GD1224]

King