compass sass - @import line expected selector or at-rule, but not because of missing semicolon -

i have compass error

line 3: invalid css after "@charset "utf-8"": expected selector or at-rule, "@import 'compass';")

the file following. not contain of own code

@charset "utf-8"  @import 'compass'; 

i know people error occurs when the @import line misses semicolon, file has semicolon.

and same files (scss , config.rb) can compiled in linux no problems.

does know wrong?

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the configuration gives error is

• windows 8.1
• ruby 2.1.6p336 (2015-04-13 revision 50298) [i386-mingw32]
• compass 1.0.3 (polaris)
• sass 3.4.16 (selective steve)

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i tried many combinations

(1) ------------------- @import 'compass';     ------------------- // line, no @charset line. // result: compilation ok, need charset because  // comments (yes comments) have utf8 chars. 

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(2) ------------------- @charset "utf-8";  @import 'compass';     ------------------- // semicolon after @charset // result: compilation error: // invalid cp950 character "\xe2" // because @charset line unrecognised 

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(3) // add config.rb encoding.default_external = 'utf-8' // https://stackoverflow.com/a/23338595/2841279 // http://blog.pixelastic.com/2014/09/06/compass-utf-8-encoding-on-windows/ // result: compilation error: expected selector or // at-rule, "@import 'compass'; 

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(4) // add config.rb encoding = "utf-8" // https://stackoverflow.com/a/13987672/2841279 // result: compilation error: expected selector or // at-rule, "@import 'compass';