ERROR: Unable to start bitbake server (None)
ERROR: Server log for this session (/mnt/a/yoe/bitbake-cookerdaemon.log):
--- Starting bitbake server pid 3260 at 2019-07-29 11:17:58.433565 ---
ERROR: Unable to parse Var <OE_IMPORTED[:=]>
Traceback (most recent call last):
  File "Var <OE_IMPORTED[:=]>", line 1, in <module>
  File "/mnt/a/yoe/sources/openembedded-core/meta/classes/base.bbclass", line 35, in oe_import(d=<bb.data_smart.DataSmart object at 0x7f9deeea95c0>):
         for toimport in oe.data.typed_value("OE_IMPORTS", d):
    >        imported = __import__(toimport)
             inject(toimport.split(".", 1)[0], imported)
  File "/mnt/a/yoe/sources/openembedded-core/meta/lib/oe/sstatesig.py", line 269, in <module>:

    >class SignatureGeneratorOEEquivHash(bb.siggen.SignatureGeneratorUniHashMixIn, SignatureGeneratorOEBasicHash):
         name = "OEEquivHash"
bb.data_smart.ExpansionError: Failure expanding variable OE_IMPORTED[:=], expression was ${@oe_import(d)} which triggered exception AttributeError: module 'bb.siggen' has no attribute 'SignatureGeneratorUniHashMixIn'