I cloned the repo today and attempted to build it, but I am receiving the build error below.

[ERROR] Failed to execute goal on project chestshop: Could not resolve dependencies for project com.acrobot.chestshop:chestshop:jar:3.10-SNAPSHOT: Failed to collect dependencies at de.themoep.showitem:api:jar:1.2.24: Failed to read artifact descriptor for de.themoep.showitem:api:jar:1.2.24: Could not transfer artifact de.themoep.showitem:api:pom:1.2.24 from/to minebench-repo (https://repo.minebench.de/): sun.security.validator.ValidatorException: PKIX path validation failed: java.security.cert.CertPathValidatorException: validity check failed: NotAfter: Fri May 31 06:36:22 EDT 2019

I tried using the install_dependency_to_repo.sh script to add them from a previous ChestShop jar, but that resulted in the same error.

Could you please advise on what I could be doing incorrectly?
Also, it seems your SSL cert on ci.minebench.de expired and will not allow access.

Apparently the nginx server didn't reload after renewing the cert the last time, sorry about that. Should be fixed now.