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Now if you enable battery optimization or low in a battery then your device limit to request as its save energy mode. The easy solution is to disable battery optimization and change the battery up of your device sufficiently.
pokemon go error 2
Follow this step For android device

• Open Setting>battery
• Click Battery optimization
• Select Not optimized
• Find Pokémon GO
• Select Don’t optimize

Follow this Step For iOS user

• Open Setting
• Find battery setting
• Turn off low power Mode.

Force Stop of Pokémon GO

IF You are still facing a network error issue then try to stop Force Stop of the Pokémon GO Game. They fix your Network Error problem permanently. Force closing can also help your lot of troubles related to the freezing and the crashing issues of the games.

• Check the Open app
• close all open app if Pokémon GO opens-close also.
• GO Pokémon GO App Setting
• Click Force Stop OF Pokémon GO.

Check your Mobile Network

Some Time not the fault of the game. if all these methods are not working then you should check your mobile network for any glitch or network issue. if you are in a crowded area, then high chance of network-related issues.
if is a cellular network problem then try stronger Wi-Fi and also check your internet provider to see they have a cap on data usage volume or internet speeds up