ESP8266 nodeMCU

This is the diag, why is there no I2C device found?

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Serial Initialized
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I2CexpDiag - i2c LCD i/o expander backpack diagnostic tool
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hd44780 lib version: 1.3.2
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Reported Arduino Revision: 1.8.19
Arduino Board: ESP8266_NODEMCU_ESP12E
CPU ARCH: ESP8266 - F_CPU: 80000000
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Serial Initialized
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I2CexpDiag - i2c LCD i/o expander backpack diagnostic tool
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hd44780 lib version: 1.3.2
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Reported Arduino Revision: 1.8.19
Arduino Board: ESP8266_NODEMCU_ESP12E
CPU ARCH: ESP8266 - F_CPU: 80000000
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SDA digital pin: 4 (GPIO4)
SCL digital pin: 5 (GPIO5)
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Checking for required external I2C pull-up on SDA - YES
Checking for required external I2C pull-up on SCL - YES
Checking for I2C pins shorted together - Not Shorted
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Scanning i2c bus for devices..
Total I2C devices found: 0
No I2C devices found