Ihave problem in my s21+ when i open the flash i receive this massage....

[mo3tazz_z]

(Can't turn on flashlight because the

light is being used by another app.)

[SamsungModerator4]

Hello. I’m Aya, Samsung Moderator
Thank you for asking the question
We wish you a happy day
Based on your inquiry regarding the update

kindly follow the below steps 
-Make sure that the device is not dropped or exposed to any liquid
-Confirm the power key is on because the device may be locked
- *#0*# Test the camera using
Click on Settings, then Other, then Application Manager, select All, click on Camera, then click on Clear Data
-Try to turn on the camera in safe mode to identify the problem, turn off the phone and turn it back on again.
During operation, press a key
Lower the volume, turn on the camera
-Make sure that the device is charged, because the camera will not work if the battery is not charged
we follow some steps as follows:
Regarding your inquiry, please confirm some steps:
It is preferable to test the camera by writing the following code in the contacts
*#0*#
Choose Mega Cam and check whether the problem persists or not
Choose front cam and check whether the problem persists or not
Please verify through the following steps
1- We access the camera
2- Then go to settings
3_ We reset the camera settings
If the problem persists
Please perform a factory reset of the device using the following steps:
-Adjustment
-Public Administration
- Reset
-Factory data reset
-Reset
-Delete all
I ask your permission
Before starting this step, please copy the phone data. It can be stored through the following link for the program
  Samsung smart switch
  http://www.samsung.com/eg/support/smartswitch
If the problem persists during the test, I ask your permission to visit us at the nearest maintenance center so that the device can be examined and the problem resolved for you.
If you’re still facing the same issue, kindly take the device to the service center to check on it.
If the issue wasn’t resolved you can honor us with your visit to the nearest service location in order to diagnose the device and solve the issue.
You can send us your city and residential area to send you the nearest service center or you can follow the link below to find the nearest one :
http://www.samsung.com/eg/support/servicelocation/

If you have any other question, can you explain it to us
We are  at your service always
Thanks for your time