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The xlsx library requires the rJava library, which in turn requires that you have a Java development kit (JDK) installed. I suggest you start by following the instructions given in the "common problems" section here. Once you have confirmed that all that is in place, install the rJava library and confirm that it loads. (If you already have it but it will not load, maybe reinstall it.) Once rJava loads, try xlsx and if necessary reinstall it.
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