I am new member of STM32 MCU. I'm working on a custom board based on a STM32F7 MCU for a GUI projects. In my projects, I store a lot of data for GUI such as: Imgae data, Fonts, Audio data in QSPI Flash. My MCU is STM32F769NI and my QSP Flash is MX25L512, that is same of STM32F769I - Discovery. When I use STM32CubeProgramer to program the demo file supply by CubeMX Driver to my board then every thing is OK. But When I build my external loader then change file extension from *.out to *.stldr (I am using IAR ) this error is appear. My external loader is follow example in "C:\Program Files\STMicroelectronics\STM32Cube\STM32CubeProgrammer\bin\ExternalLoader\N25Q256A_STM32L476G-EVAL_Cube". In my program I use BSP funtion supply by CUBE MX, and I check funtion by funtion same work. I'm stuck in this problem. Where is my error. I attack my project in this post. Can every one help me ? Thank you !!!