Harmonic Motion and uniform disk of mass

[xxphysics]

Homework Statement

A uniform disk of mass m and radius R lies in a vertical plane and is pivoted about a point a distance ℓcm from its center of mass in (Figure 1) . When given a small rotational displacement about the pivot, the disk undergoes simple harmonic motion.

Determine the period of this motion. Use the notation lcm for the distance ℓcm.
Express your answer in terms of π, acceleration due to gravity g, some or all of the variables m, R, and lcm.

Homework Equations

I = ½m*R² + m*L²

T = 2π*√[I/(m*g*L)]

The Attempt at a Solution

T = 2π*√[(R² + *L² )/(g)] was wrong

 

[haruspex]

T = 2π*√[(R² + *L² )/(g)] was wrong

That answer does not follow from your initial equations. I notice an asterisk to the left of the L. Did you omit something?
Please post your working.