error 47 in debug function when using vector on project

When including and implementing a vector from the STL located at C:\Keil\ARM\ARMCC\include\ the following error occurs when compiling a debug function. What is the link between using a vector and the printf in the debug function? Test is the class DebugSamples is located in.
Removing the vector implementation removes the error

*** error 47, line 22: sizeof returns zero

source code

static vector<float> testVector;

void Test_C::Init(void)
{
 testVector.push_back(1.0f);
}

void Test_C::DebugLog(void)
{
        DebugSamples[0][sampleCount] = amples[0];
        DebugSamples[1][sampleCount] = Samples[1];
        DebugSamples[2][sampleCount] = samples[2];
        DebugSamples[3][sampleCount] = samples[3];
        DebugSamples[4][sampleCount] = samples[4];
        DebugSamples[5][sampleCount] = sampleCount;
        sampleCount++;
        sampleCount %= DEBUG_SAMPLE_LIMIT;
}

debug function

FUNC void log_debug_samples( void )
{
  int num_samples_idx;

  // The >> concatenates to the file and > will create a new file.
  // No data will be logged if > is used and the file already exists.
  // The directory must already exist, also.
  exec("log >> c:/uvdata/mhsmpls.log");

  printf( "\n\ndebug Samples" );

     for ( num_samples_idx = 0; num_samples_idx < 1000; num_samples_idx++ )
     {
        // This prints the values from a private element of a global scope C++ object.
    printf( "\n%f\t%f\t%f\t%f\t%f\t%f",
                Test.DebugSamples[ 0 ][ num_samples_idx ],
                Test.DebugSamples[ 1 ][ num_samples_idx ],
                Test.DebugSamples[ 2 ][ num_samples_idx ],
                Test.DebugSamples[ 3 ][ num_samples_idx ],
                Test.DebugSamples[ 4 ][ num_samples_idx ],
                Test.DebugSamples[ 5 ][ num_samples_idx ]
                         );
     }

  exec("log off");
}