Initializing vector is returning a bad access error

In a class I’ve written, I am just trying to initialize a vector the way I have been in the past. Here is my header file:

#ifndef _OSC_THREAD
#define _OSC_THREAD

#include "ofMain.h"

class oscThread : of3dPrimitive {
        void setup();
        void draw();
        void update();
        ofVec3f originP;
        ofVec3f destP;
        vector<float> offsetZ;
        ofColor color;
        int   res;    //Resolution
        int   speed;  //Speed (lower=faster)
        float amp;    //Amplitude
        float f;      //Frequency
        float rot;    //Rotation
        int numVerts;
        float helixTest;
        oscThread(ofVec2f origin, ofMesh mesh);


And it is really just vector offsetZ that is giving me a bad access error, pointing me to of3DPrimitive, and then to ofNode. Does anyone have any advice? I feel like it must be something simple, but I can’t seem to figure out what I’m doing differently.