# Error - Type mismatch in method OP\_CHECK\_TOS\_INST AINSTANCE found, Unknown expected

## **Description**

The following error message appears:

![](/files/-MlFEVVUakansDjetGd6)

## **Solution**

This error is a general error for which there may be many different causes.

The cause of the problem can usually be detected in the Java Debug Console. You would need to activate the Java Debug Console in your Notes client (Tools - Show Java Debug Console)  and try to convert some documents again. When the error occurs please copy the content from the Console and email to <support@swingsoftware.com> and the support team will investigate the issue

It is also helpful if you can send the documents being converted, as per this [article](https://sites.google.com/a/swingsoftware.com/lc/pdf-converter/how-to/sending-documents).


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