Invalid password when signing Tizen package

I'm having trouble signing a basic Tizen package, here are the steps I've followed:

Installation:

• Execute the Tizen studio 3.0 web-ide installer
• Accept the license agreement
• Use the default SDK and Data location (click install)
• Launch the package manager
• Install the 4.0 wearable package
• Exit the package manager and launch Tizen studio

Create the Project:

• Launch with the default workspace
• File->new->Tizen project
• Select template
• Select wearable 4.0
• Select native application
• Select basicUI
• Finish

Create the Certificate:

• Tools->certificate manager
• Click the "+" button to create a new certificate profile
• Name the certificate "TestCert"
• Select "Create a new author certificate" and click next
• Filename:author
• Author Name:Sam
• Password:password
• Select "use the default Tizen distributor certificate" and click Finish
• Exit out of the certificate manager

Try to Build the Package:

• Select the project you created earlier
• Project->build signed package

I get this console output:

Initialize... OK
Copying files... OK
Signing... java.io.IOException: Invaild password

I am aware of these other stack overflow questions but they do not help me:

tizen studio (x64) - Build Signed Package - Creating package failed - java.io.IOexception: Invalid password

Sign application package with cerificate profile in tizen studio

Can anyone spot what I'm doing wrong?

This was all done on Debian 9.