Duc, find iccapi.h and look at the error codes in the various .h files None of the error codes listed in the iccapi.h file are negative, but ... hst_err.h:#define ENO_ROOM -29 iccapi.h:#define ICC_ERR_BASE_PATH 29 Could either of these be the problem? Hope this helps, David _______________________________________________________________________ This mailing list is neither sponsored nor endorsed by Invensys Process Systems (formerly The Foxboro Company). Use the info you obtain here at your own risks. Read http://www.thecassandraproject.org/disclaimer.html foxboro mailing list: //www.freelists.org/list/foxboro to subscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=join to unsubscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=leave