This error message indicates that the linker was unable to resolve the external symbol OrtGetApiBase in the main.obj file of the YOLOV5test project.

This could be caused by a missing or incorrect library reference. Make sure that you have included the proper libraries in your project settings and that you are linking to them correctly.

Alternatively, this error could indicate a syntax error or typo in your code. Double-check your code to ensure that all function and variable names are spelled correctly and that your code is properly formatted.