Failed plate solving

My system was working fine till with a atik 490 camera , ASI290 guide camera and cpc1100 scope. Asom now add device manager and will soon phase out poth. I have device manager and poth now. Anyway, I changed my camera to a ASI 183 everything else same. Now in SGP when I do a frame and focus I get the error message-- " Auto center failed! Slew to reference failed! Slew failed! Error transforming J2000 to JNOW! JulianDateTT - “0” is and invalid value. The valid range is 1757583.5 to 5373484.49999999". Any ideas where to start? Should I reinstall ascom? Thx so much for help. David Klein