SFML only read and set uniform in GLSL Vertex Shader

[Erid]

In my project, I was trying to use Both Vertex shader and Fragment shader, so in sf::Shader shader and i load 2 file, fragment and vertex like this
shader.loadFromFile("some_directory_to_fragment", sf::Shader::Fragment);
shader.loadFromFile("some_directory_to_vertex", sf::Shader::Vertex);
its was okay, but when i want set uniform like this:
shader.setUniform("radius", 30);
Its only find in vertex file and create error radius not found while the radius is in fragment shader, i could like delete the vertex line but i cannot do that since i need modify vertex, so How i fix this?, also i new to sfml, sorry if the help little bit `weird`

[Hapax]

If you want a shader to have both a vertex shader and a fragment shader, you specify them together:

shader.loadFromFile("some_directory_to_vertex", "some_directory_to_fragment")

see here for more info:
https://www.sfml-dev.org/documentation/2.6.1/classsf_1_1Shader.php#ac9d7289966fcef562eeb92271c03e3dc

Note: the reason there's no semi-colon in my line of code is that this method should be used as a conditional. i.e. the return value of it should be tested
e.g.

if (!shader.loadFromFile("some_directory_to_vertex", "some_directory_to_fragment"))
    return EXIT_FAILURE;

[Erid]

thank you, sorry if it bother because i new

[Hapax]

Not at all. You're welcome and hope it helps!