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<p>Checks if there has been an error. </p>
<p >The error flag does not get cleared on its own, so if an error ocurred anywhere, this method will report that. To determine whether a certain value has been parsed correctly, first use the <a class="el" href="classtram_1_1_file.html#a5c4dc235347eed3842168ad548d1d5a6" title="Resets the error flag.">reset_flags()</a> method to reset the error flag, then use the read_xyz() method to read in the value and then use this method to dete