我试图将第一次按钮设置为禁用，当用户输入数量时它被启用，按钮禁用工作正常但是当我在TextFormField中输入数量时它给出以下错误。I/flutter(29519):══╡EXCEPTIONCAUGHTBYWIDGETSLIBRARY╞═══════════════════════════════════════════════════════════I/flutter(29519):ThefollowingassertionwasthrownbuildingTextFormField(dirty,state:_TextFormFieldState#b89da):I/flutter

我试图将第一次按钮设置为禁用，当用户输入数量时它被启用，按钮禁用工作正常但是当我在TextFormField中输入数量时它给出以下错误。I/flutter(29519):══╡EXCEPTIONCAUGHTBYWIDGETSLIBRARY╞═══════════════════════════════════════════════════════════I/flutter(29519):ThefollowingassertionwasthrownbuildingTextFormField(dirty,state:_TextFormFieldState#b89da):I/flutter