when I run the functon a!fromJson(). It gives the error
Error:==
The JsonText parameter does must not be null or empty
what should i do
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You cannot pass a NULL value to that function. Where is this coming from? If it is OK that there is a NULL value, then wrap the call into an if() and check for NULL using a!isNullOrEmpty(). If it is NOT OK, I suggest to use the error() function to make others aware of that situation.