# Preview compile fails inexplicably
**URL:** https://forums.fusetools.com/t/preview-compile-fails-inexplicably/5404
**Category:** Bug Reports
**Created:** [July 9, 2016, 1:17am UTC](https://forums.fusetools.com/t/preview-compile-fails-inexplicably/5404 "2016-07-09T01:17:03Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@cyril.gantzer](https://forums.fusetools.com/u/cyril.gantzer)
#### Post date: [July 9, 2016, 1:17am UTC](https://forums.fusetools.com/t/preview-compile-fails-inexplicably/5404/1 "2016-07-09T01:17:03Z")
Using latest Fuse, OS X.
When I try to Preview a project (Local or Android), I get that:
```auto
Unexpected fatal error! Please report this to us.
Fuse 0.21.0 (build 6650)
Build started: FullCompile
Configuring (3.69s)
Compiling syntax tree
/Users/.../build/Local/Preview14/cache/MainView.g.uno(213.27): E2047: No implicit cast from 'float4' to Fuse.Controls.Rectangle
/Users/.../build/Local/Preview14/cache/MainView.g.uno(213,28,213,74): Error E2047: No implicit cast from 'float4' to Fuse.Controls.Rectangle
(1.49s)
Build completed in 5.19 seconds
1 error
Build ended
fuse: Failed to compile project
```
The thing is, I kind of see what Rectangle is causing that. If I comment it out, the build will go fine, and then I can uncomment it and the Rectangle will appear. No idea what’s happening here.
---
### Author:  [@cyril.gantzer](https://forums.fusetools.com/u/cyril.gantzer)
#### Post date: [July 9, 2016, 8:35am UTC](https://forums.fusetools.com/t/preview-compile-fails-inexplicably/5404/2 "2016-07-09T08:35:19Z")
Mystery solved: the Rectangle was given a ux:Name of “Background” which seems to be reserved. Changed the name, no more crash.