Can not open an older version of an InfoPath form- receive a schema validation error

[Pops]

Hello there,

I recently published an InfoPath form to our SharePoint Form Library
which worked fine. I then had to rejig the form slightly by adding a
few additional fields and didn't remove any of the previous fields.

Now I have the following problem:

If I try to open a new form, the form opens fine
If I try to open a form that used the previous template, I get the
following error message:

InfoPath cannot open the following file: Change Control Form.xml
The form contains schema validation errors

Further details provided on this show the following:

Element
'{http://schemas.microsoft.com/office/infopath/2003/myXSD/2006-06-06T11-18-10}signatures4'
is unexpected according to content model of parent element
'{http://schemas.microsoft.com/office/infopath/2003/myXSD/2006-06-06T11-18-10}signatures1'.

Expecting:
{http://schemas.microsoft.com/office/infopath/2003/myXSD/2006-06-06T11-18-10}signatures5.

What does it mean? I'm so confused

Anyone's comments would be extremely helpful.

Thanking you in advance
Jane

[Greg Collins [InfoPath MVP]]

Sounds like someone made some changes to the form template where they added/deleted/moved some nodes in the schema.

You will need to find out what updates were made and then use a text editor to correct the form's XML so that you can open the form in InfoPath again.