Shader Issue - latest Iris on 1.20.6 (1.7.2)

composite1.fsh: composite1.fsh: 0(56) : error C7537: OpenGL does not allow 'sample' after a type specifier
0(56) : error C0000: syntax error, unexpected '=', expecting ';' or '(' at token "="
0(73) : error C0000: syntax error, unexpected "+=", expecting "::" at token "+="
0(76) : error C0000: syntax error, unexpected "/=", expecting "::" at token "/="
0(79) : error C0000: syntax error, unexpected "*=", expecting "::" at token "*="
0(80) : error C0000: syntax error, unexpected '*', expecting "::" at token "*"
0(51) : error C1110: function "lightScattering" has no return statement