LNK1104 cannot open file 'F:\WorkSpace\trunk\target\bin\EchoScanner.dll'

This error message indicates that the linker (LNK) is unable to open the specified file, which is a DLL file for a program called EchoScanner. There could be several reasons why this error occurs, such as:

1. The specified file does not exist at the specified location.
2. The file is being used by another program or process, and hence cannot be opened.
3. The file is corrupted or damaged, and hence cannot be opened.
4. There are permission issues preventing the linker from opening the file.

To resolve the issue, you can try the following steps:

1. Verify that the specified file exists at the specified location.
2. Check if the file is being used by another process, and close the process if possible.
3. Try to repair or replace the file if it is damaged or corrupted.
4. Ensure that you have the necessary permissions to access the file.

If none of these steps work, you may need to seek further assistance from a technical expert.