Most likely your toolchain is not compatible with the target system image.
Please ensure you are using EXACTLY the same SD card image as listed for your toolchain on the toolchains page: http://gnutoolchains.com/raspberry/
No problem. Regarding the environment, we usually recommend choosing “fix value” if you are unsure. This works around the case where some PATH variables are applied for regular console sessions, but not for ‘command’ sessions used by VisualGDB to launch the debugger, leading to hard-to-trace “library not found” errors.