Hi, 
I'm about to finish this trail Get Started with Salesforce DX  Continuous Integration Using Salesforce DX Wire It All Together  but ended up with this error in Travis. See screenshot below: 


Any comments or suggestion would be a big help. I'm trying to learn the concepts of the SFDX and CI. 
Thanks in advance!

Hi, 
I'm about to finish this trail Get Started with Salesforce DX  Continuous Integration Using Salesforce DX Wire It All Together  but ended up with this error in Travis. See screenshot below: 


Any comments or suggestion would be a big help. I'm trying to learn the concepts of the SFDX and CI. 
Thanks in advance!