how to solve Exception while handling 'read_file' (thonny.plugins.micropython.mp_back.ManagementError: Script produced errors)?

Question

i'm using Thonny to operate on rasberry pi pico with micropython the script is:

def writejson(gps_altitudes, gps_time, baro_altitudes, baro_time):
    
    f = open("samples.json", "w")
    f.write('{\n"gps_altitude": [')
    
    
    
    
    result=""
    c=0
    for element in gps_altitudes:
        flag=True
        result = result+str(element)
        c+=1
        if c != len(gps_altitudes):
            result += ", "
        f.write(result)
        result=""
    
    result = result + '],\n"gps_time": ['
    
    c=0
    for element in gps_time:
        result = result+"["+str(element[0])+", "+ str(element[1])+", "+str(element[2])+"]"
        c+=1
        if c != len(gps_time):
            result += ", "
        f.write(result)
        result=""
        
    result = result +'],\n"baro_altitude": ['
    
    c=0
    for element in baro_altitudes:
        flag = True
        result = result + str(element) 
        c+=1
        if c != len(baro_altitudes):
            result += ", "
        f.write(result)
        result=""
        
    result = result+'],\n"baro_time": ['
    
    c=0
    for element in baro_time:
        result = result+"["+str(element[0])+", "+ str(element[1])+", "+str(element[2])+"]"
        c+=1
        if c != len(baro_time):
            result += ", "
        f.write(result)
        result=""
        
    f.write(']\n}')
    f.close()
    
        

to resume everything i just created a json file, the problem is that if the file exceeds a certain lenght that is variable, Thonny gives me this error when i try to open it.

PROBLEM IN THONNY'S BACK-END: Exception while handling 'read_file' (thonny.plugins.micropython.mp_back.ManagementError: Script produced errors).

log is:

    Traceback (most recent call last):
  File "B:\Thonny\lib\tkinter\__init__.py", line 1921, in __call__
    return self.func(*args)
  File "B:\Thonny\lib\site-packages\thonny\base_file_browser.py", line 586, in on_double_click
    self.open_file(path)
  File "B:\Thonny\lib\site-packages\thonny\base_file_browser.py", line 1201, in open_file
    get_workbench().get_editor_notebook().show_remote_file(path)
  File "B:\Thonny\lib\site-packages\thonny\editors.py", line 1069, in show_remote_file
    return self.show_file(make_remote_path(target_filename))
  File "B:\Thonny\lib\site-packages\thonny\editors.py", line 1043, in show_file
    editor = self.get_editor(filename, True)
  File "B:\Thonny\lib\site-packages\thonny\editors.py", line 1134, in get_editor
    return self._open_file(filename_or_id)
  File "B:\Thonny\lib\site-packages\thonny\editors.py", line 1116, in _open_file
    if editor._load_file(filename):
  File "B:\Thonny\lib\site-packages\thonny\editors.py", line 206, in _load_file
    result = self._load_remote_file(filename)
  File "B:\Thonny\lib\site-packages\thonny\editors.py", line 265, in _load_remote_file
    raise RuntimeError(response["error"])
RuntimeError: Backend terminated

i don't understand why this happen if someone can help thanks in advance (: