Cause  The file identifier specification is invalid.
 Action  The specified file identifier is the directory management structure set in the current directory.
  Check if the range of GFS_DIR_NDIR is exceeded. 

 Cause  The file handle is invalid.
 Action  Make sure that you do not forget to set the GFS_Open function value in the variable that stores the file handle.
 Make sure that the contents of the variable  are not destroyed. 

 Cause  The seek position is invalid.
 Action  Check the seek position calculated from the reference position and offset. 

 Cause  GFS_Seek reference position is invalid.
 Action  Confirm that the reference position is one of GFS_SEEK_SET, GFS_SEEK_CUR, GFS_SEEK_END
Please  . 

 Cause  The number of bytes was specified as negative.
 Action  Check the number of bytes specified in GFS_ByteToSct. 

 Cause  Offset is invalid.
 Action  Check the read start sector position specified in GFS_Load. 

 Cause  Processing remains for the specified file handle.
 Action  Either correct the program to access again after the target file is accessed,
  or review the file structure. 

 Cause  parameter is invalid.
 Action  Check that correct arguments are given to the following functions.
  ・ GFS_NwFread ・ GFS_Fread ・ GFS_SetGmode
, , GFS_SetTmode, GFS_SetReadPara, GFS_SetTransPara 

 Cause  An attempt was made to perform multiple processing.
 Action  Please refer to “6.3 Multiple processing”. 

 Cause  There is no space in the file handle.
 Action  Increase the maximum number of files that can be opened simultaneously with GFS_lnit, or
Please reduce the number of  .