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### 1.6.2 i/o Errors

These error messages are prefaced with the name of the application. A further explanation as to the reason, obtained from the standard `strerror()` utility, is appended to the messages below if possible.

`application-name: can't read filename`

  A file was not able to be opened for reading, typically because it was not found or because the user does not have permission. The file name is displayed with special characters expanded but without any default extensions or search paths that may have been tried. If you think a file exists and should have been found, there may be a problem with your `AVMINPUTS` environment variable (Environment).

`application-name: can't write filename`

  A file was not able to be opened for writing.

`application-name: can't write to filename`

  A file was successfully opened for writing but became impossible to write thereafter.

`application-name: can't spawn command`

  An attempt to execute a shell command on behalf of an interactive application failed during the `exp_popen()` call to the `libexpect` library.

`application-name: can't close filename`

  A call to the standard C procedure `fclose()` failed due to unforeseen circumstances. The error is non-fatal but the file should be checked for missing data.

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