Hi, I thank you for your answer, the truth is that it is something strange since I install it on a PC and a notebook, the two with windows 10. I installed it with Knowage-6_1_1-CE-Installer-Windows-JVM64bit-20171213.exe. I installed one on an external disk and another on the C: in both gives the same error with an Mysql Database of example.
I have installed java jdk 1.8.0x
For now it's the only thing I've tried, these days I'll try basic reports and other cockpits.
Tell me that I can try or send you some logfile so you can know if there is a problem or is something particular to me.
Thank you
Juan