I had the same thing. I used that theme for a while (currently using noir.) What it was is he configured it to run stats for a program called donkey something....Since you don't have this program, it gives you this error.

In the elegence-16/config directory look for rainmeter.ini. Delete or ; the follow sections:

[MeasureMld]
Measure=Plugin
Plugin=mldmeter.dll

[MLD-StringMeter]
Meter=STRING
X=3
Y=79
H=12
MeasureName=MeasureMLD
Fontcolor=31,31,36
Fontface="hooge 05_53"
Fontsize=6

[MLD-Meter]
Meter=HISTOGRAM
X=65
Y=78
W=34
H=12
MeasureName=MeasureMLD
BothColor=210,210,218
SecondaryColor=210,210,218
PrimaryColor=210,210,218

You won't see it again.