利用saber 2009版进行仿真，出现如下提示：
*** 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.
请问这是收敛性问题吗，我已将truncation error改为0.0000005，
target iterration：30000
max newton iterration：1000000
请问我该如何着手解决
