main.css is overwritten

[marcels2204]

using cssmin v 1.0.2
main.css will be overwritten? How to fix this?

> Running "cssmin" task

Running "cssmin:dist" (cssmin) task
Verifying property cssmin.dist exists in config...OK
Files: .tmp/styles/board.css, .tmp/styles/kendo.custom.css, .tmp/styles/sgp.style.css -> dist/styles/main.css
Options: rebase=false, report="min", sourceMap=false
Reading .tmp/styles/board.css...OK
Reading .tmp/styles/kendo.custom.css...OK
Reading .tmp/styles/sgp.style.css...OK
Writing dist/styles/main.css...OK
File dist/styles/main.css created 96.06 kB → 77.16 kB
>> 1 file created. 96.06 kB → 77.16 kB

Running "cssmin:generated" (cssmin) task
Verifying property cssmin.generated exists in config...OK
Files: bower_components/kendo-ui/styles/kendo.common.min.css, bower_components/kendo-ui/styles/kendo.default.mobile.min.css -> dist\styles\vendor.css
Files: [no src] -> dist\styles\main.css
Options: rebase=false, report="min", sourceMap=false
Reading bower_components/kendo-ui/styles/kendo.common.min.css...OK
Reading bower_components/kendo-ui/styles/kendo.default.mobile.min.css...OK
Writing dist\styles\vendor.css...OK
File dist\styles\vendor.css created 333.88 kB → 304.68 kB
Options: rebase=false, report="min", sourceMap=false
Writing dist\styles\main.css...OK
File dist\styles\main.css created 0 B → 0 B
>> 2 files created. 333.88 kB → 304.68 kB