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# ktor
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Robert Jaros

11/11/2020, 9:46 PM
I'm getting this runtime error after migrating to from 1.4.1 to 1.4.2:
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java.lang.IllegalStateException: Using blocking primitives on this dispatcher is not allowed. Consider using async channel instead or use blocking primitives in withContext(<http://Dispatchers.IO|Dispatchers.IO>) instead.
It looks like it has something to do with Jackson. Is this a known issue?
The only thing I see in the changelog for 1.4.2 is this: https://youtrack.jetbrains.com/issue/KTOR-1186
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Wilfred

11/13/2020, 3:17 PM
i also faced this issue i had to downgrade back to 1.4.0
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