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13.1 ........... INTRODUCTION
13.2 ...........  DOS ERROR CODES. 
2   ............ File not found.
3   ............ Path not found.
4   ............ Too many files open.
5   ............ Access denied.
13.3 ...........  FORCE ERROR CODES. 
256 ............ Can not read .DBF header.
257 ............ The file that you attempted to open is not a .DBF
258 ............ Error while reading .DBF file
259 ............ Internal DIR calculation error.
260 ............ File write error.
261 ............ No database in USE.
262 ............ Divide by zero.
263 ............ Call back table full.
264 ............ Attempt to access field that is not linked
265 ............ Attempt to set printer to a non-device.
266 ............ Memo buffer too small.
267 ............ Memo not opened.
268 ............ Memo buffer full.
269 ............ Bad alias pointer.
270 ............ Used LABEL or SAMPLE without a prior SET LABEL FORM.
271 ............ Menu buffer overflow.  Reset _menu_size.
272 ............  ERROR CODE NO LONGER EXISTS. 
273 ............ Not enough memory for requested block.
274 ............ Attempt to deallocate memory with an invalid handle.
275 ............ Memory chain is destroyed.
276 ............ _BLK_SIZE set to 0.
277 ............ SKIP without current pointer in the index.
278 ............ Unable to RESTORE screen.
279 ............ Index number is larger than the largest opened index.
280 ............ Only 7 indexes may be opened.
281 ............ Index file not found.
282 ............ File selected is not an index or is corrupted.
283 ............ Tried to SET ORDER TO an unopened index.
284 ............ Record out of range on GOTO.
285 ............ Attempt to access a field at EOF.
286 ............ Index file is corrupted.
287 ............ Attempt to SEEK without an index in use.
288 ............ Attempt to deallocate a locked block.
289 ............ Attempt to open a FILE or ALIAS twice.
290 ............ Field in database does not match field in definition.
291 ............ Database header does not match alias.
292 ............ Array index out of range.
293 ............ Workarea stack overflow.
294 ............ Disk full.
295 ............ Attempt to GET while device is set to print.
296 ............ SELECT <n-exp> is out of range.
297 ............ Field width exceeded during export to numeric field.
298 ............ Destination smaller than source during RESTORE.
299 ............ Invalid report.
300 ............ Undefined operand value.
301 ............ SAVE_GETS stack overflow.
302 ............ Unable to open database file.
303 ............ Character size out of bounds.
304 ............ Buffered file corrupted or not previously opened.
305 ............ Display block destroyed during EDIT.
306 ............ INTERNAL: Unable to locate block parent.
307 ............ Attempt to access a string list that has not been initialized.
308 ............ Pick list ID is out of range.
309 ............  ERROR CODE NO LONGER EXISTS. 
310 ............ Attempt to perform MENU TO without prior @...PROMPT.
311 ............ DOS version 2.0 or greater required.
312 ............ DOS version 3.1 or greater required.
313 ............  ERROR CODE NO LONGER EXISTS. 
314 ............ Command requires exclusive use of database.
315 ............ Command requires file lock.
316 ............ Command requires record lock.
317 ............ INTERNAL: Cannot accept handle duplication.