php - File system is not writable

Question

I installed Drupal 7 in a web host successfully. After installing a module, I got an error errors and and status report gave me this error message:

File system Not writable
The directory /Applications/MAMP/tmp/php does not exist.
You may need to set the correct directory at the file system settings page or
change the current directory's permissions so that it is writable.

I check the permissions for (sites/default/files) and it has 755 permissions and I change it to 777 but nothing happened so I return it back.

I have the following setting for (Home ? Administration ? Configuration ? Media):

Public file system path
sites/default/files

Temporary directory
/Applications/MAMP/tmp/php

and here is the error I am getting:

Warning: file_put_contents(temporary://fileDyFbDg) [function.file-put-contents]: failed to open stream: "DrupalTemporaryStreamWrapper::stream_open" call failed in file_unmanaged_save_data() (line 1898 of /home/imamus/public_html/includes/file.inc).
The file could not be created.
Warning: file_put_contents(temporary://fileeTFMpl) [function.file-put-contents]: failed to open stream: "DrupalTemporaryStreamWrapper::stream_open" call failed in file_unmanaged_save_data() (line 1898 of /home/imamus/public_html/includes/file.inc).
The file could not be created.
Warning: file_put_contents(temporary://fileuB8Tdu) [function.file-put-contents]: failed to open stream: "DrupalTemporaryStreamWrapper::stream_open" call failed in file_unmanaged_save_data() (line 1898 of /home/imamus/public_html/includes/file.inc).
The file could not be created.
Warning: file_put_contents(temporary://filea1KYXG) [function.file-put-contents]: failed to open stream: "DrupalTemporaryStreamWrapper::stream_open" call failed in file_unmanaged_save_data() (line 1898 of /home/imamus/public_html/includes/file.inc).
The file could not be created.

Please advice.

Answer 1

I check the permissions for (sites/default/files) and it has 755 permissions and I change it to 777 but nothing happened so I return it back.

do the same for /Applications/MAMP/tmp/php