Error generating preview, please contact an administrator. Adapt Framework V5

[jzhivov]

trying to use your plugin on Adapt Version 5 but getting this error

Command failed: grunt server-build:prod --outputdir=courses/5ed6ce5976433a0b762f7146/5ed8d1522497f977637296b8/build --theme=5ed6fa4811c1f54278eca1be --menu=adapt-contrib-boxMenu

Fatal error: {
"message": "variable @secondary-color is undefined",
"type": "Name",
"filename": "src/components/adapt-expose/less/expose.less",
"index": 2018,
"line": 142,
"column": 14,
"callLine": null,
"extract": [
"\t\tpadding: 20px;",
"\t\tbackground: @secondary-color;",
"\t\tcolor: #ffffff;"
]
}�