Avoid using 0.00 as a temperature value. Use something just larger than the "alpha tolerance", otherwise the value you input will be treated as a "strain" (hence them message regarding 0 being ambient).

By default the "alpha tolerance" is 0.05, so any value you enter less than this will be taken as a strain (or the expansion coefficient in units of length/length).

So instead of T1=0.0, use:
a) 0.051, and if this isn't sufficient then
b) In the Configuration Module reduce the "alpha tolerance" value, to say perhaps 0.001 and then define T1 as 0.002.

Read the "Help Text" on the temperature field and the "alpha tolerance" field for additional insight into this.