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I am running Magento 2.3 with NGINX, PHP7.1 and MariaDb.
This is a fresh instalation with pre-loaded data.
I am getting these follow error:

$ tail var/log/system.log

[2019-01-09 16:36:24] main.ERROR: Error: Application is not installed yet.   

[2019-01-09 16:36:24] main.ERROR: Error: Application is not installed yet.   

[2019-01-09 16:36:24] main.ERROR: Error: Application is not installed yet.   

[2019-01-09 17:33:08] main.WARNING: Memory size allocated for the temporary table is more than 20% of innodb_buffer_pool_size. Please update innodb_buffer_pool_size or decrease batch size value (which decreases memory usages for the temporary table). Current batch size: 100000; Allocated memory size: 50000000 bytes; InnoDB buffer pool size: 134217728 bytes.  

[2019-01-09 17:33:08] main.WARNING: Memory size allocated for the temporary table is more than 20% of innodb_buffer_pool_size. Please update innodb_buffer_pool_size or decrease batch size value (which decreases memory usages for the temporary table). Current batch size: 100000; Allocated memory size: 50000000 bytes; InnoDB buffer pool size: 134217728 bytes.  

[2019-01-09 17:33:09] main.WARNING: Memory size allocated for the temporary table is more than 20% of innodb_buffer_pool_size. Please update innodb_buffer_pool_size or decrease batch size value (which decreases memory usages for the temporary table). Current batch size: 100000; Allocated memory size: 50000000 bytes; InnoDB buffer pool size: 134217728 bytes.  

[2019-01-09 17:33:10] main.WARNING: Memory size allocated for the temporary table is more than 20% of innodb_buffer_pool_size. Please update innodb_buffer_pool_size or decrease batch size value (which decreases memory usages for the temporary table). Current batch size: 100000; Allocated memory size: 50000000 bytes; InnoDB buffer pool size: 134217728 bytes.  

[2019-01-09 17:33:11] main.WARNING: Memory size allocated for the temporary table is more than 20% of innodb_buffer_pool_size. Please update innodb_buffer_pool_size or decrease batch size value (which decreases memory usages for the temporary table). Current batch size: 100000; Allocated memory size: 50000000 bytes; InnoDB buffer pool size: 134217728 bytes.  

[2019-01-09 17:33:11] main.WARNING: Memory size allocated for the temporary table is more than 20% of innodb_buffer_pool_size. Please update innodb_buffer_pool_size or decrease batch size value (which decreases memory usages for the temporary table). Current batch size: 100000; Allocated memory size: 50000000 bytes; InnoDB buffer pool size: 134217728 bytes.  

[2019-01-09 17:33:36] main.WARNING: Memory size allocated for the temporary table is more than 20% of innodb_buffer_pool_size. Please update innodb_buffer_pool_size or decrease batch size value (which decreases memory usages for the temporary table). Current batch size: 3334; Allocated memory size: 40008000 bytes; InnoDB buffer pool size: 134217728 bytes.  

And these are screenshots:

How can I solve these errors?
Any idea?

You need to run the following commands :

php bin/magento setup:upgrade

php bin/magento setup:static-content:deploy -f

php bin/magento cache:flush   

check if it resolves the issue

try remove folder:

rm -rf generated/ 

rm -rf pub/static/frontend/ 

rm -rf var/cache/

after that, run command:

php bin/magento setup:upgrade

php bin/magento setup:di-compile

php bin/magento setup:static-content:deploy

Please try to give permission as follow

cd <your Magento install dir> 



find . -type f -exec chmod 644 {} ;               // 644 permission for files

find . -type d -exec chmod 755 {} ;               // 755 permission for directory 

find ./var -type d -exec chmod 777 {} ;           // 777 permission for var folder    

find ./pub/media -type d -exec chmod 777 {} ;

find ./pub/static -type d -exec chmod 777 {} ;



chmod 777 ./app/etc

chmod 644 ./app/etc/*.xml