diff --git a/hyb_bwa.c b/hyb_bwa.c
index 074ce9f..b480856 100644
--- a/hyb_bwa.c
+++ b/hyb_bwa.c
@@ -338,7 +338,7 @@ HybridIndex* bwa_hyb_idx_load_from_disk(const char* idx_prefix) {
 #define __load_hybrid_idx_code(suffix, data)  \
     sec_time = realtime();                    \
     sprintf(fn, "%s%s", idx_prefix, suffix);  \
-    err_check_true(stat(fn, &st), 0);         \
+    err_check_true(stat(fn, &st), 0, fn);     \
     fp = xopen(fn, "r");                      \
     data = (uint8_t*)malloc(st.st_size);      \
     err_fread_noeof(data, 1, st.st_size, fp); \
diff --git a/hyb_utils.c b/hyb_utils.c
index 821cd38..825a329 100644
--- a/hyb_utils.c
+++ b/hyb_utils.c
@@ -23,7 +23,7 @@ HybridIndex* load_hybrid_idx(const char* prefix) {
 
 #define __load_hybrid_idx_code(suffix, data)  \
     sprintf(fn, "%s%s", prefix, suffix);      \
-    err_check_true(stat(fn, &st), 0);         \
+    err_check_true(stat(fn, &st), 0, fn);     \
     fp = xopen(fn, "r");                      \
     data = (uint8_t*)malloc(st.st_size);      \
     err_fread_noeof(data, 1, st.st_size, fp); \
diff --git a/share_mem.c b/share_mem.c
index 1fe07fe..b256da7 100644
--- a/share_mem.c
+++ b/share_mem.c
@@ -45,7 +45,7 @@ int shm_keep_hyb(const char* idx_prefix) {
         perror("shm_open()");                                                          \
         return -1;                                                                     \
     }                                                                                  \
-    err_check_true(stat(full_path, &st), 0);                                           \
+    err_check_true(stat(full_path, &st), 0, full_path);                                \
     if (ftruncate(shmid, st.st_size) < 0)                                              \
         return -1;                                                                     \
     idx_name_len = 8 + strlen(file_name) + 1;                                          \
diff --git a/share_mem.h b/share_mem.h
index 6265b66..2727bcb 100644
--- a/share_mem.h
+++ b/share_mem.h
@@ -2,7 +2,7 @@
 
 #include "utils.h"
 
-#if 0
+#if 1
 #define HYB_PAC_SUFFIX ".hyb.pac"
 #define HYB_SA_SUFFIX ".hyb.bytesa"
 #define HYB_KMER_SUFFIX ".hyb.kmer"
diff --git a/utils.h b/utils.h
index c1f2d7e..ee236ed 100644
--- a/utils.h
+++ b/utils.h
@@ -81,9 +81,9 @@
 #endif
 #endif
 
-#define err_check_true(ret_code, right_val) \
+#define err_check_true(ret_code, right_val, err_str) \
     if ((ret_code) != (right_val))          \
-    err_fatal("err_check", "Value not right: True-Val %d\n", right_val)
+    err_fatal("err_check", "Value not right: True-Val %d\n%s\n", right_val, err_str)
 
 #define err_check_false(ret_code, err_val) \
     if ((ret_code) == (err_val))           \
@@ -93,7 +93,7 @@
     do {                                          \
         FILE* fp = NULL;                          \
         struct stat st;                           \
-        err_check_true(stat(fn, &st), 0);         \
+        err_check_true(stat(fn, &st), 0, fn);     \
         fp = xopen(fn, "r");                      \
         data = (uint8_t*)malloc(st.st_size);      \
         err_fread_noeof(data, 1, st.st_size, fp); \