エラー：「開いているファイルが多すぎます」...しかし、なぜですか？

問題を切り分けるために、コードをこれまで減らしました。基本的に何が起こっているのかというと、createInstTable（）の関数呼び出しの後にfopen（）を使おうとすると、ファイルを開くことができず、「開いているファイルが多すぎます」というエラーが表示されます。私が開こうとしているプログラムとテキストファイルは同じフォルダにあります。コメントアウトするとファイルが正常に開くため、問題はcreateInstTable（）関数にあることがわかっています。fopen（）を使用した後にcreateInstTable（）を呼び出すと、ファイルは正常に開きますが、ファイルから読み取ろうとすると、混乱します。誰かが私にこのエラーを与えているかもしれないcreateInstTable（）関数で何が起こっているのか理解できますか？前もって感謝します！コードは次のとおりです。

// Libraries
#include <stdio.h>
#include <stdlib.h>
#include <string.h>


// Defines
#define     SIZE    50
#define     BUFLEN  81


// Structs
typedef struct inopform{
    char instruction[8];
    char opCode[3];
    int  format;
} inopform;


// Prototypes
void createInstTable(inopform* inst);


// main
int main(int argc, char* argv[]) {

    inopform* inst  = (inopform*)calloc(SIZE, sizeof(inopform));

    createInstTable(inst);

    FILE *ifp = fopen(argv[1], "r");

    if (ifp == NULL)
        perror("Error: failed to open.");
    else
        printf ("\n  Successfully opened file\n\n");

    fclose(ifp);

    return 0;
} // end main


// fills the instruction table with the instruction names, corresponding op codes and formats
void createInstTable(inopform* inst) {
    int i = 0;

strcpy(inst[i].instruction, "MULR");   inst[i].instruction[4] = '\0';   strcpy(inst[i].opCode, "98");   inst[i].opCode[2] = '\0';   inst[i].format = 2;  printf("%s\t%s\t%d\n", inst[i].instruction, inst[i].opCode, inst[i].format); i++;
strcpy(inst[i].instruction, "WD");     inst[i].instruction[2] = '\0';   strcpy(inst[i].opCode, "DC");   inst[i].opCode[2] = '\0';   inst[i].format = 3;  i++;
strcpy(inst[i].instruction, "AND");    inst[i].instruction[3] = '\0';   strcpy(inst[i].opCode, "40");   inst[i].opCode[2] = '\0';   inst[i].format = 3;  i++;
strcpy(inst[i].instruction, "LPS");    inst[i].instruction[3] = '\0';   strcpy(inst[i].opCode, "D0");   inst[i].opCode[2] = '\0';   inst[i].format = 3;  i++;
strcpy(inst[i].instruction, "TIXR");   inst[i].instruction[4] = '\0';   strcpy(inst[i].opCode, "B8");   inst[i].opCode[2] = '\0';   inst[i].format = 2;  i++;
strcpy(inst[i].instruction, "SUBF");   inst[i].instruction[4] = '\0';   strcpy(inst[i].opCode, "5C");   inst[i].opCode[2] = '\0';   inst[i].format = 3;  i++;
strcpy(inst[i].instruction, "LDX");    inst[i].instruction[3] = '\0';   strcpy(inst[i].opCode, "04");   inst[i].opCode[2] = '\0';   inst[i].format = 3;  i++;
strcpy(inst[i].instruction, "SVC");    inst[i].instruction[3] = '\0';   strcpy(inst[i].opCode, "B0");   inst[i].opCode[2] = '\0';   inst[i].format = 2;  i++;
strcpy(inst[i].instruction, "STT");    inst[i].instruction[3] = '\0';   strcpy(inst[i].opCode, "84");   inst[i].opCode[2] = '\0';   inst[i].format = 3;  i++;
strcpy(inst[i].instruction, "TIX");    inst[i].instruction[3] = '\0';   strcpy(inst[i].opCode, "2C");   inst[i].opCode[2] = '\0';   inst[i].format = 3;  i++;
strcpy(inst[i].instruction, "FLOAT");  inst[i].instruction[5] = '\0';   strcpy(inst[i].opCode, "C0");   inst[i].opCode[2] = '\0';   inst[i].format = 1;  i++;
strcpy(inst[i].instruction, "LDT");    inst[i].instruction[3] = '\0';   strcpy(inst[i].opCode, "74");   inst[i].opCode[2] = '\0';   inst[i].format = 3;  i++;
strcpy(inst[i].instruction, "STA");    inst[i].instruction[3] = '\0';   strcpy(inst[i].opCode, "0C");   inst[i].opCode[2] = '\0';   inst[i].format = 3;  i++;
strcpy(inst[i].instruction, "SHIFTR"); inst[i].instruction[6] = '\0';   strcpy(inst[i].opCode, "A8");   inst[i].opCode[2] = '\0';   inst[i].format = 2;  i++;
strcpy(inst[i].instruction, "STB");    inst[i].instruction[3] = '\0';   strcpy(inst[i].opCode, "78");   inst[i].opCode[2] = '\0';   inst[i].format = 3;  i++;
strcpy(inst[i].instruction, "SIO");    inst[i].instruction[3] = '\0';   strcpy(inst[i].opCode, "F0");   inst[i].opCode[2] = '\0';   inst[i].format = 1;  i++;
strcpy(inst[i].instruction, "LDA");    inst[i].instruction[3] = '\0';   strcpy(inst[i].opCode, "00");   inst[i].opCode[2] = '\0';   inst[i].format = 3;  i++;
strcpy(inst[i].instruction, "HIO");    inst[i].instruction[3] = '\0';   strcpy(inst[i].opCode, "F4");   inst[i].opCode[2] = '\0';   inst[i].format = 1;  i++;
strcpy(inst[i].instruction, "DIVF");   inst[i].instruction[4] = '\0';   strcpy(inst[i].opCode, "64");   inst[i].opCode[2] = '\0';   inst[i].format = 3;  i++;
strcpy(inst[i].instruction, "LDCH");   inst[i].instruction[4] = '\0';   strcpy(inst[i].opCode, "50");   inst[i].opCode[2] = '\0';   inst[i].format = 3;  i++;
strcpy(inst[i].instruction, "JEQ");    inst[i].instruction[3] = '\0';   strcpy(inst[i].opCode, "30");   inst[i].opCode[2] = '\0';   inst[i].format = 3;  i++;
strcpy(inst[i].instruction, "SSK");    inst[i].instruction[3] = '\0';   strcpy(inst[i].opCode, "EC");   inst[i].opCode[2] = '\0';   inst[i].format = 3;  i++;
strcpy(inst[i].instruction, "LDS");    inst[i].instruction[3] = '\0';   strcpy(inst[i].opCode, "6C");   inst[i].opCode[2] = '\0';   inst[i].format = 3;  i++;
strcpy(inst[i].instruction, "J");      inst[i].instruction[1] = '\0';   strcpy(inst[i].opCode, "3C");   inst[i].opCode[2] = '\0';   inst[i].format = 3;  i++;
strcpy(inst[i].instruction, "SUB");    inst[i].instruction[3] = '\0';   strcpy(inst[i].opCode, "1C");   inst[i].opCode[2] = '\0';   inst[i].format = 3;  i++;
strcpy(inst[i].instruction, "RD");     inst[i].instruction[2] = '\0';   strcpy(inst[i].opCode, "D8");   inst[i].opCode[2] = '\0';   inst[i].format = 3;  i++;
strcpy(inst[i].instruction, "LDB");    inst[i].instruction[3] = '\0';   strcpy(inst[i].opCode, "68");   inst[i].opCode[2] = '\0';   inst[i].format = 3;  i++;
strcpy(inst[i].instruction, "RSUB");   inst[i].instruction[4] = '\0';   strcpy(inst[i].opCode, "4C");   inst[i].opCode[2] = '\0';   inst[i].format = 3;  i++;
strcpy(inst[i].instruction, "MULF");   inst[i].instruction[4] = '\0';   strcpy(inst[i].opCode, "60");   inst[i].opCode[2] = '\0';   inst[i].format = 3;  i++;
strcpy(inst[i].instruction, "JSUB");   inst[i].instruction[4] = '\0';   strcpy(inst[i].opCode, "48");   inst[i].opCode[2] = '\0';   inst[i].format = 3;  i++;
strcpy(inst[i].instruction, "SUBR");   inst[i].instruction[4] = '\0';   strcpy(inst[i].opCode, "94");   inst[i].opCode[2] = '\0';   inst[i].format = 2;  i++;
strcpy(inst[i].instruction, "DIVR");   inst[i].instruction[4] = '\0';   strcpy(inst[i].opCode, "9C");   inst[i].opCode[2] = '\0';   inst[i].format = 2;  i++;
strcpy(inst[i].instruction, "LDL");    inst[i].instruction[3] = '\0';   strcpy(inst[i].opCode, "08");   inst[i].opCode[2] = '\0';   inst[i].format = 3;  i++;
strcpy(inst[i].instruction, "STSW");   inst[i].instruction[4] = '\0';   strcpy(inst[i].opCode, "E8");   inst[i].opCode[2] = '\0';   inst[i].format = 3;  i++;
strcpy(inst[i].instruction, "COMPF");  inst[i].instruction[5] = '\0';   strcpy(inst[i].opCode, "88");   inst[i].opCode[2] = '\0';   inst[i].format = 3;  i++;
strcpy(inst[i].instruction, "TIO");    inst[i].instruction[3] = '\0';   strcpy(inst[i].opCode, "F8");   inst[i].opCode[2] = '\0';   inst[i].format = 1;  i++;
strcpy(inst[i].instruction, "JLT");    inst[i].instruction[3] = '\0';   strcpy(inst[i].opCode, "38");   inst[i].opCode[2] = '\0';   inst[i].format = 3;  i++;
strcpy(inst[i].instruction, "MUL");    inst[i].instruction[3] = '\0';   strcpy(inst[i].opCode, "20");   inst[i].opCode[2] = '\0';   inst[i].format = 3;  i++;
strcpy(inst[i].instruction, "OR");     inst[i].instruction[2] = '\0';   strcpy(inst[i].opCode, "44");   inst[i].opCode[2] = '\0';   inst[i].format = 3;  i++;
strcpy(inst[i].instruction, "COMP");   inst[i].instruction[4] = '\0';   strcpy(inst[i].opCode, "28");   inst[i].opCode[2] = '\0';   inst[i].format = 3;  i++;
strcpy(inst[i].instruction, "TD");     inst[i].instruction[2] = '\0';   strcpy(inst[i].opCode, "E0");   inst[i].opCode[2] = '\0';   inst[i].format = 3;  i++;
strcpy(inst[i].instruction, "STS");    inst[i].instruction[3] = '\0';   strcpy(inst[i].opCode, "7C");   inst[i].opCode[2] = '\0';   inst[i].format = 3;  i++;
strcpy(inst[i].instruction, "LDF");    inst[i].instruction[3] = '\0';   strcpy(inst[i].opCode, "70");   inst[i].opCode[2] = '\0';   inst[i].format = 3;  i++;
strcpy(inst[i].instruction, "ADD");    inst[i].instruction[3] = '\0';   strcpy(inst[i].opCode, "18");   inst[i].opCode[2] = '\0';   inst[i].format = 3;  i++;
strcpy(inst[i].instruction, "FIX");    inst[i].instruction[3] = '\0';   strcpy(inst[i].opCode, "C4");   inst[i].opCode[2] = '\0';   inst[i].format = 1;  i++;
strcpy(inst[i].instruction, "NORM");   inst[i].instruction[4] = '\0';   strcpy(inst[i].opCode, "C8");   inst[i].opCode[2] = '\0';   inst[i].format = 1;  i++;
strcpy(inst[i].instruction, "STF");    inst[i].instruction[3] = '\0';   strcpy(inst[i].opCode, "80");   inst[i].opCode[2] = '\0';   inst[i].format = 3;  i++;
strcpy(inst[i].instruction, "CLEAR");  inst[i].instruction[5] = '\0';   strcpy(inst[i].opCode, "B4");   inst[i].opCode[2] = '\0';   inst[i].format = 2;  i++;
strcpy(inst[i].instruction, "ADDF");   inst[i].instruction[4] = '\0';   strcpy(inst[i].opCode, "58");   inst[i].opCode[2] = '\0';   inst[i].format = 3;  i++;
strcpy(inst[i].instruction, "STCH");   inst[i].instruction[4] = '\0';   strcpy(inst[i].opCode, "54");   inst[i].opCode[2] = '\0';   inst[i].format = 3;  i++;
strcpy(inst[i].instruction, "STX");    inst[i].instruction[3] = '\0';   strcpy(inst[i].opCode, "10");   inst[i].opCode[2] = '\0';   inst[i].format = 3;  i++;
strcpy(inst[i].instruction, "RMO");    inst[i].instruction[3] = '\0';   strcpy(inst[i].opCode, "AC");   inst[i].opCode[2] = '\0';   inst[i].format = 2;  i++;
strcpy(inst[i].instruction, "COMPR");  inst[i].instruction[5] = '\0';   strcpy(inst[i].opCode, "A0");   inst[i].opCode[2] = '\0';   inst[i].format = 2;  i++;
strcpy(inst[i].instruction, "SHIFTL"); inst[i].instruction[6] = '\0';   strcpy(inst[i].opCode, "A4");   inst[i].opCode[2] = '\0';   inst[i].format = 2;  i++;
strcpy(inst[i].instruction, "STL");    inst[i].instruction[3] = '\0';   strcpy(inst[i].opCode, "14");   inst[i].opCode[2] = '\0';   inst[i].format = 3;  i++;
strcpy(inst[i].instruction, "ADDR");   inst[i].instruction[4] = '\0';   strcpy(inst[i].opCode, "90");   inst[i].opCode[2] = '\0';   inst[i].format = 2;  i++;
strcpy(inst[i].instruction, "STI");    inst[i].instruction[3] = '\0';   strcpy(inst[i].opCode, "D4");   inst[i].opCode[2] = '\0';   inst[i].format = 3;  i++;
strcpy(inst[i].instruction, "JGT");    inst[i].instruction[3] = '\0';   strcpy(inst[i].opCode, "34");   inst[i].opCode[2] = '\0';   inst[i].format = 3;  i++;
strcpy(inst[i].instruction, "DIV");    inst[i].instruction[3] = '\0';   strcpy(inst[i].opCode, "24");   inst[i].opCode[2] = '\0';   inst[i].format = 3;  printf("%s\t%s\t%d\n", inst[i].instruction, inst[i].opCode, inst[i].format);

    return;
} // end createInstTable

私が得る出力は次のとおりです。

MULR 98 2 DIV 24 3エラー：開くことができませんでした。：開いているファイルが多すぎます