利用saber 2009版進行仿真，出現如下提示：

*** ERROR "MAST_NO_NUM_EQUATION" *** Numerically no equation at /current_in(
sense_current_3p.sense_current_3p2).
*** ERROR "MAST_NO_NUM_EQUATION" *** Numerically no equation at /current_in(
sense_current_3p.sense_current_3p3).

*** ERROR "ALG_SINGULAR_JACOBIAN" *** Singular Jacobian matrix.
Some possible causes for a singular Jacobian matrix:
- Model operating outside of its intended region of operation.
- Node/subsystem with no connection to the reference (floating).
- Current loops (voltage sources/inductors in parallel).
- Missing equation and/or missing variable reference.

Partial results were written to the initial point "dcerr".
execution time= 0.141 sec.
messages given: 3 errors

*** ERROR "CLASS_BAD_IP" *** The initial point "dc" has been created with a
different design.

請問這是收斂性問題嗎，我已將truncation error改為0.0000005，

target iterration：30000

max newton iterration：1000000

請問我該如何著手解決