java.lang.IllegalArgumentException: Object would be serialized to `null`: Android

I was having this same issue, my first error was passing a CharSequence instead a String as a parameter (your Object[]), and my other error was passing an Object[] as another parameter (I solved this by sending a String instead, like : String.valueOf(your_object_list)) Dont forget to handle this on your server side, you will receive a String instead of an Object.

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