It seems like the issue you are experiencing, is caused by the single quote ('
) in the name of the used cryptographic identity. We are not escaping it well and this breaks the build process in AppBuilder. This is definitely a bug in our product, which we will try to fix as soon as possible. Meanwhile, the only possible workaround would be to use another Cryptographic Identity for signing the app, that doesn't have the above mentioned single quote symbol ('
) in its name. I hope this helps.
Please, accept my sincere apologies for the all the inconvenience caused by the issue and thank you for the understanding in advance. I will make sure to write back as soon as the defect is fixed on our live servers and you can continue the development with your original code signing.