PSF, current probe, and Gmin

I am new to Cadence and on this occasion I would like to ask three questions:

1. When I ran a spectre simulation, sometimes I got an error message requiring me to delete the psf file. This is quite annoying since I have to close Cadence, delete the psf file, and open Cadence again. I would like to know how to prevent this to occur again in the future.

- Warning -

<COM.cadence.awd.graph.GraphManager@1b7b407>

Plot command failed: cannot open data set tran-tran in results directory /home/simulation/test/spectre/schematic/psf

2. I tried to measure the DC base (B), collector (C), emitter (E) currents but when I selected the corresponding B/C/E transistor terminals, I got an error message: 'ERROR /T6/B is not a kept output.' I have set 'Select device currents (currents)' under Output-->Save all to ALL.

3. After I ran a transient simulation, I got this warning

Notice from spectre during IC analysis, during transient analysis 'tran'. Gmin = 1 pS is large enough to noticeably affect the DC solution. dV(T6.npn:int_b) = 15.4256 kV. Use 'gmin_check' option to eliminate or expand this report.

Where can I find gmin_check andmore importantly I don't know how to solve this problem? I also notice that the value of dv(...) is too large. What causes this?

Thanks