I was evaluating your Word (Aspose.Word) component and ran into this problem. Here is the stack trace:
[Exception: Writing sprmPChgTabs to stream not implemented. Please report this file to email@example.com.
Your file includes a seldom used feature of Word file format that were have never encountered before in our test files. Could you please send the file to firstname.lastname@example.org and we will implement support for this feature.
In the meantime you can probably workaround this problem by saving the file in “full saved” format. Just go to Tools/Options menu in Word, select Save tab and untick Allow Fast Saves checkbox, then save your file. The problem should disappear.