Node-red to firebase data sending

i am trying too send data from node-red to google firebase and facing the issue.(attached snap shot)
please help to solve.

you have a permission problem with fire base. Check the username and password are correct, and see if you can do what you want outside of Node-RED to check if it is a problem with firebase or Node-RED

thank you
it was issue from firebase.
now it is working.

i am sending plc data to fire base and its done successfully through MODBUS TCPIP.

i have some questions regarding NODE-RED.

how many modbus register can read through NODE-RED.(is there limitation?)
to run the NODE-RED internet connectivity is require compulsory?( any solution to run NODE-RED without internet.)

please guide me for the same.

Your first question is about a contrib-node. Your best bet is probably to ask on the github page of the node you are using.

You do not need an internet connection to use Node-RED

i tried with node-red to get data from plc and send it to database.
it is usefull.
i have question that is it require licence for running or it is free for lifetime.

If you mean the core Node-RED the license is available here for you to read.

Third party contrib nodes that you install in Node-RED may have different license terms and you should check these before you install any node

this is free license or chargeable after some time period?

Read the license file, especially point 2.

Grant of Copyright License. Subject to the terms and conditions of
this License, each Contributor hereby grants to You a perpetual,
worldwide, non-exclusive, no-charge, royalty-free, irrevocable
copyright license to reproduce, prepare Derivative Works of,
publicly display, publicly perform, sublicense, and distribute the
Work and such Derivative Works in Source or Object form.

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thank you.