请教一个仿真过程中碰到的一个error

#error info is below：
Error-[NOA] Null object access
/proj/library/pub/env/tb/tb_pg_seqlib.svh, 405
The object at dereference depth 1 is being used before it was
constructed/allocated.
Please make sure that the object is allocated before using it.
tb_pg_seqlib.svh, 405 is below：
tile_o.pg_mst.ip_regs.register(pgmst_reg_name).read(status, orig_value);

想请教下error info中The object at dereference depth 1 ，depth 1是指的pg_mst未allocated吗?

是不是没有new

Please make sure that the object is allocated before using it.

多谢回复，我是指b_pg_seqlib.svh, 405 is below：
tile_o.pg_mst.ip_regs.register(pgmst_reg_name).read(status, orig_value);

The object at dereference depth 1 ，depth 1是指的pg_mst未allocated吗?

depth 1所指的对象是tile_o还是pgmst_reg_name?

小编你好！请问问题解决了吗?我现在也遇到这个error了，向你请教一下，谢谢！