We discoverd a Bug in iMSCP 1.1.15, which polute / with files like: iMSCP::File=HASH(0x33459c0)
This Bug is fixed in the 1.1.x branch and we will release a fixed version 1.1.16 this night.
Please remove ALL iMSCP::File=HASH(0x33459c0) in / then start the Update (when it's released)