Invalid file name

From ISPWiki

To solve the problem try again by providing a valid file name.

Following are general rules for both Linux and Unix (including *BSD) like systems:

• You can use upper and lower-case letters, numbers, "." (dot), and "_" (underscore) symbols.
• You can use other special characters such as blank space (not advisable).
• File names may contain any character except / (root directory), which is reserved as the separator between files and directories in a pathname. You

Linux / UNIX: reserved characters and words

Avoid using the following characters from appearing in file names:

<, >, |, \, :, (, ), &.

For more information please read the article Linux / UNIX: Rules For Naming File And Directory Names