@neino said: EDIT: After install Ruby in C:\Programs\Ruby192 the error is still the same. What Should I change/do to use sockets library under Sketchup? Sketchup cannot use Ruby in the 1.9.x trunk. You should install a branch of Ruby in the 1.8.x trunk, and recommend the same version and patch level that matches the interpreter DLL distro'd with Sketchup 8: ****Ruby Binary Installer(s): Ruby (v1.8.6-p287) Windows One-Click Installer Other posts on the sockets issue: Interest in a Networking Sockets Workaround Clients <--> Server Communication (Sockets?) Requiring Socket on Mac crashes SU