Error in android studio avd - linux

while opening avd in linux shows error: /root/Android/Sdk/tools/emulator -netdelay none -netspeed full -avd Nexus_5_API_22
PANIC: HOME is defined but could not find Nexus_5_API_22.ini file in $HOME/.android/avd
(Note: avd is searched in the order of $ANDROID_AVD_HOME,$ANDROID_SDK_HOME/.android/avd and $HOME/.android/avd)
Cannot launch AVD in emulator.Why?