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The software's paths to the system folders are specified under File>System Options. There is a path setting for the LOGS folder where the .log files are written to when you poll.
That path needs to be set to the software’s LOGS folder location. You can right click on your desktop shortcut to access the software and look at the “properties” to see what folder your drive letter and folder your program is housed in. That way, you will be able to utilize the window that appears when you click the square to the right of the log files entry in the System Options window to select the correct path to the LOGS folder.
If the path is already correct, then the error is telling you that the program is being blocked from writing to or creating a file in that folder. A user must have complete read and write access to all of the files in the program folder (C:\OTBWIN by default). Users also need to have access to read and write files in the Windows (or WINNT) folder. The TNA.INI and TNASRWND.TPS files in the Windows (or WINNT) folder must be accessible.
To fix the problem, check the user's permissions and access setting to the software's folder on that PC and correct them. Sometimes the problem is Windows incorrectly reporting the file as inaccessible. Rebooting the PC may fix the problem.