Error message

• Notice: Undefined offset: 0 in ext_node_preprocess_node() (line 149 of sites/all/modules/custom/ext_node/ext_node.module).
• Notice: Undefined offset: 0 in ext_node_preprocess_node() (line 149 of sites/all/modules/custom/ext_node/ext_node.module).
• Notice: Undefined offset: 0 in ext_node_preprocess_node() (line 149 of sites/all/modules/custom/ext_node/ext_node.module).
• Notice: Undefined offset: 0 in ext_node_preprocess_node() (line 149 of sites/all/modules/custom/ext_node/ext_node.module).
• Notice: Undefined offset: 0 in ext_node_preprocess_node() (line 149 of sites/all/modules/custom/ext_node/ext_node.module).