I have the same problem
Unable to load shader animbright3:
Init Shader 'animbright3':
Fragment shader:
Fragment shader failed to compile with the following errors:
ERROR: 0:7: error(#206) Assigning non-constant to: const highp float
ERROR: 0:8: error(#206) Assigning non-constant to: const highp float
ERROR: error(#273) 2 compilation errors. No code generated
Linking:
Fragment shader(s) were not successfully compiled before glLinkProgram() was called. Link failed.