calc using variable

[ClassicalMark]

this line:

height: calc(var(--contactfigw)*1.058);

prompts this error:

CSScomb error:
(node:13272) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 2): [object Object]
(node:13272) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.