Precondition Failed (ETag doesn't match)

[AdleeAfif]

I have been trying to set two string values with setString() command. However, after running it, it says the ETag doesn't match as I stated in the title. It seems the way I use the command wrongly, if so, is there anyway for me to do the similar thing using different way?
Below are my code and the returned error. Thank you in advance!

[mobizt]

That should not happen if the library was properly installed and use it normally.

Please remove all Firebase libraries found in the Arduino libraries folder and install the latest version again.

Please make sure that no concurrent data set to the same RTDB node from other clients happened.

[AdleeAfif]

Alright will give it a try and update to you, thank you!

[AdleeAfif]

Hello @mobizt it seems like the problem still occur.

Is it possible because my syntax to write into the firebase is wrong?

Here's the code:

Because it can properly run if I just put only one variable in the IF statement. Thank you and sorry for bothering you.

[AdleeAfif]

Please make sure that no concurrent data set to the same RTDB node from other clients happened.

Sorry didn't see this one just now, may I know what does that mean? Still new in this

[mobizt]

Are you trying to pass number to the setString function?

You should try this basic example for proper usage.

[mobizt]

For "concurrent data set", I mean some devices or clients are trying to change the database at the same path at the same time.

[mobizt]

Please update the library and also try to create new Firebase project.