Hi, the solution after my long investigation is:
There may be a problem with permissions of your folders. Your webhosting provider may restricts the access to folders which have permissions of 777 (read/write/execute for Owner/Group/World).
You should have the correct folder permissions set to 755 (read/write/execute for Owner and Read for Group/World) for folders and 644 for files (Read/Write for Owner, Read for Group/World)
This applies to all folders in which is the joomlawatch.js.php, -> components,
com_joomlawatch, js .. check and set the correct permissions
I would also like to thank Charles Fernandez from www.heavensapartments.com
who made allowed me find the cause of this problem on his hosting provider.
You can use Total Commander (ghisler.com) to access your FTP (Ctrl + N). Then, when connected, and with cursor on folder, click Files -> Change Attributes