# Error during Monte Carlo simulation

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#### jayapraksh

##### Newbie level 6
Hai all,
Got this error message during monte carlo simulation in mentor graphics

OBJECT "M6": Model P not yet defined.
OBJECT "M13": Model N not yet defined.

Can anyone the reason for this error? Do I need to add new library files? I'm using pyxis version 10.1

#### erikl

##### Super Moderator
Staff member
As the error message tells you: the model files for models "P" & "N" cannot be found.

jayapraksh

### jayapraksh

points: 2

#### AMS012

##### Full Member level 3
You need to add the libraries for the P and N type mosfets.

jayapraksh

### jayapraksh

points: 2

#### jayapraksh

##### Newbie level 6
After adding model files it shows the error message, error code 2, that is unable to open file name, what sholud I do?

#### erikl

##### Super Moderator
Staff member
... unable to open file name ...
This probably means it can find the models, but cannot read it. The MC simulation program needs read access to the model files resp. library.

In UNIX/LINUX:

Code:
chmod 644 file_name

jayapraksh

### jayapraksh

points: 2

#### jayapraksh

##### Newbie level 6
Okay. Thank you for your help. I don't know much about LINUX. Let me try n ll get back to you. Thank you

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