Goto the process-studio-5.6.0\psplugins\DesktopPlugins\desktop-engine\windows\bin or ae-agent\psplugins\DesktopPlugins\desktop-engine\windows\bin folder
Check SahiWin.exe and SahiWin.exe.config files from this location.
Remove the extra space added in the SahiWin.exe and SahiWin.exe.config file names and restart the agent/process-studio