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<h4 class="subsection">1.6.4 File Format Errors</h4>

<p>Certain application crashes result from an application not adhering
to the required conventions about data and file formats, or because the
application was invoked in the wrong mode (<a href="Modes-of-Operation.html#Modes-of-Operation">Modes of Operation</a>). These
are the following.

     <dl>
<dt><var>application-name</var><code>: invalid text format (code </code><var>nn</var><code>)</code><dd><a name="index-g_t_0040code_007binvalid-text-format_007d-77"></a>An application that was expected to return a string of characters to
be written to a text file returned data that did not correspond to any
valid character representation. 
<br><dt><var>application-name</var><code>: null character in prompt</code><dd>An interactive application (invoked rightly or wrongly with <samp><span class="option">-i</span></samp>,
<samp><span class="option">-t</span></samp>, or <samp><span class="option">-s</span></samp>) is required to exchange strings of non-null
characters internally with <code>avram</code>, and used a null. 
<br><dt><var>application-name</var><code>: invalid file name (code </code><var>nn</var><code>)</code><dd>The data structure representing a file obtained from an application
has a name consisting of something other than character strings. This
error could be the result of a filter mode application (<a href="Filter-Mode.html#Filter-Mode">Filter Mode</a>) being invoked in parameter mode. 
(<a href="Parameter-Mode.html#Parameter-Mode">Parameter Mode</a>)
<br><dt><var>application-name</var><code>: null character in file name</code><dd><a name="index-g_t_0040code_007bnull-character-in-file-name_007d-78"></a>Similar to the above errors. 
<br><dt><var>application-name</var><code>: bad character in file name</code><dd><a name="index-g_t_0040code_007bbad-character-in-file-name_007d-79"></a>Slashes, backslashes, and unprintable characters other than spaces are
also prohibited in file names. 
<br><dt><var>application-name</var><code>: invalid output preamble format</code><dd><a name="index-g_t_0040code_007binvalid-output-preamble-format_007d-80"></a>According the format used by <code>avram</code> for data files, a data file
may contain an optional text portion, known as the preamble. This
error occurs when a data file obtained from an application can not be
written because the preamble is something other than a list of
character strings. 
<br><dt><var>application-name</var><code>: invalid file specification</code><dd><a name="index-g_t_0040code_007binvalid-file-specification_007d-81"></a>This error occurs in situations where the data structure for a file
obtained by evaluating the application is too broken to permit any
more specific diagnosis. 
<br><dt><code>avram: invalid raw file format in </code><var>application-name</var><dd><a name="index-g_t_0040code_007binvalid-raw-file-format_007d-82"></a>The file containing the virtual machine code was not able to be
loaded, because the code was not in a recognizable format. Either the
file has become corrupted, the compiler that generated it has a
bug in it, or the wrong file was used as a virtual code file. 
</dl>

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