Error building image

[JoelVeloz]

I get this error:
{"errorDetail":{"message":"When using COPY with more than one source file, the destination must be a directory and end with a /"},"error":"When using COPY with more than one source file, the destination must be a directory and end with a /"}

when i exec this:
this.docker.buildImage(pack, { t: imageName }, (err, res) => { if (err) { console.log('Error ALERT: ', err); return; } const stream = fs.createWriteStream(logPath, { flags: 'a' }); res.pipe(stream); res.pipe(process.stdout); });