I ran into this error when I was trying to use the same shader across different environments; it worked in most environments but was giving me problems in WebGL on Chrome 72. The source of the problem was that my environments were using different versions of GLSL. In some environments I needed to use the texture() function. In some others I needed to use the texture2D() function. To keep compatibility across both environments I added a simple define at the beginning of my script.
#if __VERSION__ < 130 #define TEXTURE2D texture2D #else #define TEXTURE2D texture #endif