CSS issue meteor 1.3: Cannot call method 'replace' of null

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Hi, There is something weird going on in meteor 1.3. I get this error if I put some css in a css file in the client\ folder

While minifying app stylesheet:
   packages/minifier-css/minifier.js:184:1: Cannot call method 'replace' of null
   at toOSPath (packages/minifier-css/minifier.js:184:1)
   at pathRelative (packages/minifier-css/minifier.js:205:1)
   at packages/minifier-css/minifier.js:164:1
   at Array.forEach (native)
   at Function._.each._.forEach (packages/underscore/underscore.js:105:1)
   at packages/minifier-css/minifier.js:122:1
   at Array.forEach (native)
   at Function._.each._.forEach (packages/underscore/underscore.js:105:1)
   at rewriteRules (packages/minifier-css/minifier.js:99:1)
   at Object.CssTools.rewriteCssUrls (packages/minifier-css/minifier.js:85:1)
   at packages/minifier-css/minifier.js:55:1
   at Array.forEach (native)
   at Function._.each._.forEach (packages/underscore/underscore.js:105:1)
   at Object.CssTools.mergeCssAsts (packages/minifier-css/minifier.js:32:1)
   at packages/minifyStdCSS/plugin/minify-css.js:79:1
   at CssToolsMinifier.processFilesForBundle (packages/minifyStdCSS/plugin/minify-css.js:17:1)

if I then put some default CSS in, I saw a good (bug ugly) sequence diagram, … (No clue what happens)
http://www.w3schools.com/html/html_css.asp

/*body {
    background-color: powderblue;
}
h1 {
    color: blue;
}
p {
    color: red;
}

(related to SOLVED: Sequence diagram in meteor: Cannot read property '_actors_height' of undefined)

Meteor does not accept this css

actor {
    stroke: #CCCCFF;
    fill: #ECECFF;
}

text.actor {
    fill:black;
    stroke:none;
    font-family: Helvetica;
}

actor-line {
    stroke:grey;
}

messageLine0 {
    stroke-width:1.5;
    stroke-dasharray: "2 2";
    marker-end:"url(#arrowhead)";
    stroke:black;
}

messageLine1 {
    stroke-width:1.5;
    stroke-dasharray: "2 2";
    stroke:black;
}

#arrowhead {
    fill:black;

}

messageText {
    fill:black;
    stroke:none;
    font-family: 'trebuchet ms', verdana, arial;
    font-size:14px;
}

labelBox {
    stroke: #CCCCFF;
    fill: #ECECFF;
}

labelText {
    fill:black;
    stroke:none;
    font-family: 'trebuchet ms', verdana, arial;
}

loopText {
    fill:black;
    stroke:none;
    font-family: 'trebuchet ms', verdana, arial;
}

loopLine {
    stroke-width:2;
    stroke-dasharray: "2 2";
    marker-end:"url(#arrowhead)";
    stroke: #CCCCFF;
}

note {
    stroke: #decc93;    
    fill: #ADCF33;
}

noteText {
    fill:black;
    stroke:none;
    font-family: 'trebuchet ms', verdana, arial;
    font-size:14px;
}

in sequenceDiagram.css in client\ folder