xUnit test build error: missing filename for /html

Hello i get this message when I try to grenerate html report .

Command line arguments are for example:

%teamcity.build.checkoutDir%\UnitTests\bin\Debug\UnitTests.dll
/html "D:\TeamCity\Reports\xUnit\xUnitReport.html"

and this is working through command line outside TeamCity. But when I past these args to TeamCity CommandLine Argument box

it failes with "xUnit test build error: missing filename for /html"

Thanks for replies.