symbol lookup error: kmymoney KF5

[aga]

I've been using KF5 now for several days, with some minor problems, but
basically useable for me.

However, on attempting to run KMM today I got this -
"
kmymoney: symbol lookup error: kmymoney: undefined symbol:
_ZTI12MyMoneyMoney
aga at z"

I've uninstalled and reinstalled but it persists.  I've even used a new
sandbox with the same results, so I'm stumped.

Please can anyone put me out of my misery.

Allan