fix

Author: soulgalore

lib/tc.js

@@ -20,8 +20,7 @@ async function getDefaultInterface() {
     if (result.stdout.length === 0) {
       const result = await shell('sudo ip route show');
       throw new Error(
-        'There was an error getting the default interface %s',
-        result.stdout
+        `There was an error getting the default interface ${result.stdout}`
       );
     }
     return result.stdout;