OpenGL 3.3 - I can only bind to GL_TEXTURE0 - c++

Question

I've been trying to follow an OpenGL-3.3 tutorial for some time but it appears that I can only bind a texture to GL_TEXTURE0 otherwise I get a black square.
Example:
This works
glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT);
glActiveTexture(GL_TEXTURE0 + 0);
glBindTexture(GL_TEXTURE_2D, texture1);
glUniform1i(glGetUniformLocation(shader.program, "our_texture1"), 0);
shader.bind();
glBindVertexArray(vertex_array);
glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
glBindVertexArray(0);
This doesn't
glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT);
glActiveTexture(GL_TEXTURE0 + 1);
glBindTexture(GL_TEXTURE_2D, texture1);
glUniform1i(glGetUniformLocation(shader.program, "our_texture1"), 1);
shader.bind();
glBindVertexArray(vertex_array);
glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
glBindVertexArray(0);
Details:
shader.bind simply calls glUseProgram
Vertex Shader:
#version 330 core
layout (location = 0) in vec3 position;
layout (location = 1) in vec3 color;
layout (location = 2) in vec2 tex_coords;
out vec4 our_color;
out vec2 our_tex_coords;
void main()
{
gl_Position = vec4(position, 1.0f);
our_color = vec4(color, 1.0f);
our_tex_coords = tex_coords;
}
Fragment Shader:
#version 330 core
out vec4 color;
in vec4 our_color;
in vec2 our_tex_coords;
uniform sampler2D our_texture1;
void main()
{
color = texture(our_texture1, our_tex_coords);
}
Texture Creation:
GLuint texture1;
glGenTextures(1, &texture1);
glBindTexture(GL_TEXTURE_2D, texture1);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
sf::Image image1;
if (!image1.loadFromFile("../Assets/container.jpg"))
{
error();
}
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, image1.getSize().x, image1.getSize().y, 0, GL_RGBA, GL_UNSIGNED_BYTE, image1.getPixelsPtr());
glGenerateMipmap(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, 0);
From what I can inspect the file is loaded correctly. Any idea on what may be wrong?

Answer 1

The earlier answer tells you how to change the code to make it work, but gives the wrong explanation. In this sequence:
glActiveTexture(GL_TEXTURE0 + 1);
glBindTexture(GL_TEXTURE_2D, texture1);
glUniform1i(glGetUniformLocation(shader.program, "our_texture1"), 1);
shader.bind();
with shader.bind() calling glUseProgram(), there is indeed a problem with the sequence. But it has nothing to do with glActiveTexture(), which is completely unrelated to the currently bound program.
The glUniform1i() call sets a uniform value on the currently bound program. So the key is that you call glUseProgram() before glUniform*(). For example, the following sequence will work:
glActiveTexture(GL_TEXTURE0 + 1);
glBindTexture(GL_TEXTURE_2D, texture1);
shader.bind();
glUniform1i(glGetUniformLocation(shader.program, "our_texture1"), 1);

Answer 2

Your code looks good.
But I think shader.bind() should be called before glActiveTexture in general.
Further hint: If you want your texture to be antialiased when minification is used, take GL_LINEAR_MIPMAP_LINEAR instead of GL_LINEAR. This should work out of the box since you already generated MIPMaps.
Best regards,
Chris