Error message

• Notice: Trying to access array offset on value of type bool in eval() (line 3 of /home/nicolask/public_html/sites/all/modules/computed_field/computed_field.module(468) : eval()'d code).
• Notice: Trying to access array offset on value of type null in eval() (line 3 of /home/nicolask/public_html/sites/all/modules/computed_field/computed_field.module(468) : eval()'d code).
• Notice: Trying to access array offset on value of type bool in eval() (line 3 of /home/nicolask/public_html/sites/all/modules/computed_field/computed_field.module(468) : eval()'d code).
• Notice: Trying to access array offset on value of type null in eval() (line 3 of /home/nicolask/public_html/sites/all/modules/computed_field/computed_field.module(468) : eval()'d code).