Mingsho on "[Plugin: Slider] Failed to open stream and several errors"

I am new to php so i have no idea what these errors relate to.
Errors:
fopen()- no such directory in ...plugins\gallery-slider\gallery-slider.php on line 34
filesize()
fclose() expects parameter to be resource...
fread() expects parameter to be resource....etc

https://wordpress.org/plugins/gallery-slider/