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i/o bus error

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I am working with a 15" UniStream series PLC. This PLC has modules on its backplane(3xrs232 COM + 2xUIA-0006) and other modules added with two UAG-XKPxxx expanders.First expander(6xUIS-0800TC), Second expander(2xWide digital + 4UIA-0800n) The problem is that when I download the project into the PLC, it gives me an error because the  App i/o configuration detects the UAG-XKPxxx modules but then PLC cannot find them. However, it does find the modules added after the expander. The project was developed in version 1.35 and has also been tested with the latest available version 1.36


Any ideas? We have downloaded the IOS files to all the modules, wiring checked...

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