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XML. files and Author-IT problems (SDL Studio 2019)

Hello, I'm writing because I'm having problems with XML. files and the Author-IT. First of all, I can't save any document as an XML. file because it doesn’t find the tag configuration file (INI) named Author-IT XML.But I have an INI Author-IT. Secondly, I can't open some xml. files that I have to translate because the argument “picture” must be an image that can be used as an Icon. I don't know what to do. Besides, the document is locked or protected and I cannot unlock it.As it doesn't work I alwasy close the document and another message appears saying "Reference to object instance is not established as an object". BTW, I have SDL Trados 2019. Can someone help me?

Thanks,

Vanessa