Serial4 And Serial5 Setup

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Vishnu
Hi I am trying to use Serial-4 and Serial-5 when i am trying this i am getting error like this ...
Uncaught Error: Field or method does not already exist, and can't create it on undefined
at line 1 col 8
Serial4.setup(9600);
```
    ^
```
=undefined
In the firmware... i have modified

#define USARTS 3
to
#define USARTS 5
Still i am getting error ....

any suggestions

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