Question: I am having issues with permission denied errors both in the schematic
and in the analysis. When I double click on an NPN transistor in the schematic, I receive
the following error message:
Permission denied 'C:\MC9\LIBRARY\NOM_LIB.INX'
Error occurred while trying to write index for file 'C:\MC9\LIBRARY\NOM.LIB'.
File: C:\MC9\DATA\circuit1.cir.
Then when I try to run a transient simulation on this circuit, the following error
occurs:
Permission denied 'C:\MC9\DATA\circuit1.TNO'
File: C:\MC9\DATA\circuit1.cir
How do I get past these errors?
Answer: The permission denied error occurs when Micro-Cap is unable to perform the
necessary read or write to the specified file. In most cases, the inability to perform a
write operation is what triggers the error. There are two main causes for this.
1) The folder the file is located in or the specific file itself has been write protected.
The Windows operating system controls these permissions. Right click on the folder or
file in Windows Explorer and select Properties. The object may be write protected
through its Attributes or within the Security page. Make sure that the write operation
is allowed. A simple way to check to see if the folder is write protected is to load a
program such as Notepad and try to save a small text file to the folder. If you are able
to successfully save a file, then the folder is fine, and it may be the specific file that
is the issue.
2) The path that Micro-Cap is trying to write the file to does not exist. If any of the
folders within the path do not exist, then the write operation will fail. For most
cases, the paths that Micro-Cap uses are defined within the Paths dialog box. Go to the
File menu and select Paths. In the dialog box that is invoked, check that all of the
specified paths are valid. When the OK button is clicked in this dialog box, Micro-Cap
will automatically check the validity of all specified paths and will return an error
message specifying any invalid paths. An invalid path in this dialog box usually occurs
when a Micro-Cap installation is copied directly from one system to another but its
location on the hard drive is shifted to a different partition or folder.
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