Debug Assertion Failed! Expression: __acrt_first_block == header
<p>I am trying to test the dll which I wrote with GoogleTest and when I call one of the tests It throws me this error:</p>

<p><img src="https://i.stack.imgur.com/35a8Z.png" alt="enter image description here"></p>

<p>I have come to the conclusion that the problem is in assigning memory to vectors but I don't know how to resolve this as I am fairly new to C++ programming. The code is as follows:</p>

<pre class="lang-cpp prettyprint-override"><code>#ArraysCPP11.h
#ifdef ARRAYSCP11_EXPORTS
#define ARRAYSCP11_API __declspec(dllexport)
#else
#define ARRAYSCP11_API __declspec(dllimport)
#endif

__declspec(dllexport) void removeWhiteSpaces(std::vector&lt;std::string&gt; v, std::vector&lt;std::string&gt; &amp;output);
</code></pre>

<pre class="lang-cpp prettyprint-override"><code>#ArraysCPP11.cpp
void removeWhiteSpaces(std::vector&lt;std::string&gt; v, std::vector&lt;std::string&gt; &amp;output) { //odstranjevanje presledkov iz vector-ja (vsak drugi element je bil presledek)
    for (std::vector&lt;std::string&gt;::iterator it = v.begin(); it != v.end(); it++) {
        std::string buffer = *it;
        if (isdigit(buffer[0])){;
            output.push_back(*it);
        }
    }
}
</code></pre>

<pre class="lang-cpp prettyprint-override"><code>#TestTemp.h

template&lt;class T&gt; 
class TestTemp
{
public:
   TestTemp();
   void SetValue(T obj_i);
   T GetValue();
   bool alwaysTrue();
   bool TestTemp&lt;T&gt;::formattingTest(std::string input, std::vector&lt;std::string&gt; realVector, std::vector&lt;std::string&gt; formattedInput);
private:
   T m_Obj;
};

template&lt;class T&gt;
inline bool TestTemp&lt;T&gt;::formattingTest(std::string input, std::vector&lt;std::string&gt; realVector, std::vector&lt;std::string&gt; formattedVector) {
std::string input2 = input;
//  std::vector&lt;std::string&gt; fResult;
std::string first;
std::string second;
bool endResult = true;
std::vector&lt;std::string&gt; end;
//std::vector&lt;std::string&gt; result = split(input2, ' ');
removeWhiteSpaces(formattedVector,end);
std::vector&lt;std::string&gt;::iterator yt = realVector.begin();
for (std::vector&lt;std::string&gt;::iterator it = end.begin(); it != end.end(); it++, yt++) {
    first = *it;
    second = *yt;
    if (first.compare(second) != 0) {
        endResult = false;
        break;
    }
}
return endResult;
}
</code></pre>

<pre class="lang-cpp prettyprint-override"><code>   #ArraysCPP11-UnitTest.cpp
struct formattingTesting{
   //   formattingTesting* test;
   std::string start;
   std::vector&lt;std::string&gt; endResult;
   formattingTesting() {
   }
   explicit formattingTesting(const std::string start, const std::vector&lt;std::string&gt; endResult)
    : start{start}, endResult{endResult} 
   {
   }
};

struct fTest : testing::Test {
   formattingTesting* test;
   fTest() {
      test = new formattingTesting;
   }
   ~fTest() {
      delete test;
   }
};

struct format {
   std::string start;
   std::vector&lt;std::string&gt; end;
};

struct formTest : fTest, testing::WithParamInterface&lt;format&gt; {
   formTest() {
      test-&gt;start = GetParam().start;
      test-&gt;endResult = GetParam().end;
   }
};

TEST_P(formTest, test1) {
   bool endResult = true;
   TestTemp&lt;int&gt; TempObj;
   std::string first;
   std::string second;
   //std::string start ("1  2 3 4 5 6 7 8 9 10");
   //std::vector&lt;std::string&gt; end = { "1","2","3","4","5","6","7","8","9","10" };
   std::vector&lt;std::string&gt; start2 = { "1","","2","3","4","5","6","7","8","9","10" };
   std::string start = GetParam().start;
   std::vector&lt;std::string&gt; end = GetParam().end;
   bool result = TempObj.formattingTest(start,end,start2);      
   EXPECT_TRUE(result);
}

INSTANTIATE_TEST_CASE_P(Default, formTest, testing::Values(
   format{ "1", {"1"} },
   format{ " ", {} },
   format{ "1 2 3 4 5",{"1","2","3","4","5"} },
   format{ "1  2 3 4 5  6", {"1","2","3","4","5","6"} }
));


int main(int argc, char** argv)
{
   testing::InitGoogleTest(&amp;argc, argv);
   RUN_ALL_TESTS();
   return 0;
}
</code></pre>