[Plugin: Jetpack] jetpack-error.php

I’ve not using my web for a while, about a couple weeks, without doing any change as far as i can remember.

but now when i want to update the content and check my web, this message comes as a warning

Warning: require_once(/…/public_html/blog/wp-content/plugins/jetpack/class.jetpack-error.php) [function.require-once]: failed to open stream: No such file or directory in …/public_html/blog/wp-content/plugins/jetpack/jetpack.php on line 45

Fatal error: require_once() [function.require]: Failed opening required ‘…/public_html/blog/wp-content/plugins/jetpack/class.jetpack-error.php’ (include_path=’.:/usr/lib/php:/usr/local/lib/php’) in …/public_html/blog/wp-content/plugins/jetpack/jetpack.php on line 45

I’m really blank bout what i should do, this warning shows even if I go to my website, or my dashboard. So I have no idea where and how to fix it either. I can still access the folder via FTP, but I don’t know what’s the content of jetpack-error.php or jetpack.php that I should change.

Please help. Thank you.